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Home My WebLink AboutAgenda Report - August 7, 1991 (81),� OF " CITY OF LODI c91/Fp�' AGENDA TITLE: Ama-�d Traffic Resolution by Approving Speed Limits on Kettleman Lane between Highway 99 Northbound Ramps and East City Limit MEETING DATE: August 7, 1991 PREPARED BY: Public Wod<s Director RECOMMENDED ACTION: That the City Council amid the traffic resolution by approving speed limits cn Kettleman Lane Between the Highway 99 Northbound Ramps and the East City Limit. BACKGROUND INFORMATION: Public Works staff has recently updated engineering and traffic studies for 7 streets. These studies are performed following State of California Department of Transportation (Caltrans) guidelines in accordance with California Vehicle Code Section 40802. Based on the Vehicle Code Section 40802, in order to use radar enforcement, it is necessary to conduct engineering and traffic studies every five years on "non -local" streets. "Non -local" streets are the collector and arterial streets as shown on the Federal Aid System Maps. The engineering and traffic studies include measurement of prevailing speeds by a radar survey, review of unexpected conditions to the driver and accident data. The speed limits for the 6 streets were previously adopted in August 1986. There are six streets that have no changes to existing speed limits and do not need City Council approval (see Table 1). The existing speed limits on the majority of these streets were mainly based on the 35th percentile speeds observed in the field. The street that does need City Council's approval i s Kettleman Lane, east of the Highway 99 ramps. The City has recently annexed additional property, thereby extending the Easterly City Limits by approximately 1,130 feet on Kettleman Lane. The existing speed limit on Kettleman Lane west of the Highway 99 ramps was established by Caltrans and is posted at 35 mph. Ecxn Beckman Road easterly, the existing speed limit is 45 mph as established by San Joaquin County without a formal study for radar enforcement. Staff recommends establishing a 40 mph from Beckman Road to the east city 'limits. This will provide a smooth transition between existing zones. The 85th percentile of the two radar speed studies support this recommendation. APPROVED THOMAS A PETERSON Council Communication Amend Traffic Resolution for Kettleman Lane August 7, 1391 Page 2 Staff requests that Council approve the Kettleman Lane speed limit indicated in Table 1. If Council changes the recamranended limits, such changes will not be radar enforceable. FUNDING: Funding to be provided by the street maintenance account. Cac L. Rarisko Publ'c Works Director Prepared by Richard C. Prima Jr., Assts ant City Engineer, and Torn Cartwright, Traffic Engineering Assistant JLR/TC/cl1 Attachment cc: Police Chief Street Superintendent Assistant Civil Engineer -Traffic CTRAFF34/TXTW, 02M (CO. COM) July 31, 1991 ENGINEERING AND TRAFFIC SUZY I �S SEE NARRATIVE FOR BACKGROUND INFORMATION cl 2B5 sc� p OZ' N i I { 1 K T i LEivlAfv - LN::. SPEED TABLE I ROADWAf VADTR f Na OF LANES I Z MEDIAN (TYPE) I N uE -TRAFFIC SKMAL DATA AVERAGE DARY TRAFFIC t 08S SPET_D-CRMCAL.BS °+D Es - _PACE 1X3 -72-wDj Y2 7b 33 k3 I17 -MEDIAN % Co ' 37 �E]OSTRAG SPEED IDNE - ',6 FA rP-7 MVH S5'APH <ls MRA 'lS Nt4H(CoomLYY PROPOSED SPEED ZONE 3`5//PA' '"fes %b MPN -- - NQ'' Cocm✓•'7 LEGEND' MPH( EED 1 _ RI -STOP s" R2! ) -SID L"T sm WA R39 --MO smm - C - SUkLATla �� 25MPM ;.oxo. 0—TAAFFK AGMN.' ----QiY IMaR ----tRiiKSL SP® -LOwER UW! OF PAa _..—_ ------ I O - 7 4 9 /0 kLi Ml, c... MI ... .. OF LODI KETTLEMAN LNzoNE SPEEDCITY I I ..... � °�« PUBLIC WORKS DEPARTMENT � SURVEY -^—..�.�...�....,.�......r.....x.. ....tiwarm:wa.w.ws«se..ow.».,.......�..-.,,....,..r..o<,.....,.�,......:...+.,,:....,«,.r.._............_...__.�..-.__...Y _.-..�.. ,,, August 1991 SPEED ZONE REPORT - Kettleman Lane REFERENCE - Speed zone surveys are performed i n the City of Lodi following State of California Department of Transportation (Cal trans) guidelines i n accordance w i t h Section 40802 (b) of the California Vehicle Code. These guidelines are outlined in Chapter 8 of the Caltrans Traffic Manuzl. ° STUM Important factors to consider in determining the speed limit which is most appropriate to facilitate the orderly movement of traffic and that is reasonably safe are prevailing speeds , unexpected conditions to drivers, and accident records. Prevailing Speeds (85th Percentile Speeds - Reasonable speed limits co orm to the lbe�ior o t e majority of motorists, and by measuring motorists: speeds, one will be able to select a speed limit that is both reasonable and effective. Speed limits should normally be established at the first five mile per hour increment below the 85th percentile speed. However, in matching existing conditions with the traffic safety needs of the community, engineering judgement n y indicate the need for a further reduction of five miles per hour. Two radar surveys were performed and the 85th percentile ranged from 40 t o 42 mph. Unexoected Conditions )Mm roadside development results in traffic conflicts and unusual conditions which are not readily apparent to drivers, speed limits below the 85th percentile are warranted. The following factors were considered: roadway design speed, safe stopping sight distance, superelevation, shoulder conditions, profile condition, intersection spacing and offsets, commercial driveway characteristics , and pedestrian traffic in the roadway without sidewalks. There are no unexpected conditions used to further reduce the speed limit. Accidents Accident records of the two most recent years were considered in determining the speed zones. Accidents on segments of roadways are classified by their accident rate. Accident rates are determined by the number of accidents occurring within a segment of rcadway and the traffic volume within that segment. Accident rates are shown in accidents per million vehicle miles (ACC/MVM). The accident rate is 8.8 ACC/MVM. The latest average city-wide accident rate is 4:6 ACC/MVM. SPEEDZI3/TXTW.02M SPEED ZONE REPORT - Kettleman Lane Page ° CONCLUSION - The following posted speed limits are appropriate: Kettleman Lane Segment Existing Recommended Highway 99 Ramps - Beckman Road 35 mph 35 mph Beckman Road - City Limits 45 mph 40 mph Kettleman Lane has a posted speed limit of 35 mph to the Highway 99 northbound ramps. Kettleman Lane west o f Highway 99 northbound ramps i s under the State of California (Caltrans) jurisdiction. Since the segment between Highway 99 ncrthbound ramps and Beckman Road is to short to perform a speed survey, the posted speed limit of 35 mph is appropriate. Based on the 85th percentile speeds observed in the field, a posted speed limit of 40 mph between Beckman Road and the east city limit is recommended. It is not recommended to further reduce the speed zones due to unexpected conditions and accident data. The 40 mph speed zone allows a transition area between the Caltran's 35 mph speed zone and the County's 45 mph. Jack L. Ronsko Public Worms Director JLR/nl SPEEDZI3/TXTW.02M 1-1 C ( ENGINEERING z 1 AND TRAFFIC SURVEY I SEE NARRATIVE FOR q y •r BACKGROUND 114FCIRIAAT10N g �L C - BRANDYWINIE CR SPEED TABLE ROADWAY WkWH 4y� NO. OF LANES MEDWN rro--) NONE TRAFFIC SGNAL DATA NIR AVERAGE. DOiY TRAFFIC ;000 oB& sPE¢D-awrocAL.ss B 's 3 Ea � -PACEM) 6 Z7- v (®Z)2�• 8L E81 .3lo (?Z) -MED" S .7/ 30 EB 30 3/ EXISTING SPEED ZONE OJa MaH PROPOSED SPEED ZONE ?S.VFIIf LEGENC= MPH _ RI -smP srm _.. .. ., R7S ) -9r® tart sol RM -%= star 7S wx wa -.CRnrAL SPUD --.0OLogra rxt -_ - -- -- -. ACCIDENT PUN YR= / ! YR 89 ACCIDENT RJ9E-ACG/MRS- VEHrMI. p' 7>= a » . "P.rF .. , Gdi EiF+I CITY OF LODI _.. _....._ BRANDYWINE DR SPEER ZONE .. p/4 _ °MKµ " " PUBVC WORKS DEPARTMENTSURVEY ti i August 1991 SPEED ZONE REPORT - Brandywine Drive REFERENCE - Speed zone surveys are performed in the City of Lodi following State of California Department o f Transportation (Caltrans) guidelines in accordance with Section 40802(b) of the California Vehicle Code. These guidelines are outlined in Chapter 8 of the Caltrans Traffic Manual. STUDY Important factors to consider in determining the speed limit which is most appropriate to facilitate the orderly movement of traffic and that is reasonably safe are prevailing speeds, unexpected conditions to drivers, and accident records. Prevailing Speeds (85th Percentile Speeds) - Reasonable speed limits conform tote actual behavior ot the majority of motorists, and by measuring motorists' speeds, one will be able to select a speed limit that is both reasonable and effective. Speed limits should normally be established at the first five mile per hour increment below the 85th percentile speed. However, in matching existing conditions with the traffic safety needs of the community, engineering judgement nuy indicate the need for a further reduction of five miles per hour. Four radar surveys were performed and the 85th percentile ranged from 34 to 37 mph. Unexpected Conditions Wlrn roadside development results in traffic conflicts and unusual conditions which are not readily apparent to drivers, speed limits below the 85th percentile are warranted. The following factors were considered: roadway design speed, safe stopping sight distance, superelevation, shoulder conditions, profile condition, intersection spacing and offsets, commercial driveway characteristics, and pedestrian traffic in the roadway without sidewalks. There are no unexpected conditions used to further reduce the speed limit. Accidents Accident records of the two most recent gears were considered in determining the speed zones. Accidents on segments of roadways are classified by their accident rate. Accident rates are determined by the number of accidents occurring within a segment of roadway and the traffic volume within that segment. Accident rates are shown in accidents per million vehicle miles (ACC/MVM). The accident rate is 1.4 ACG/MVM. The latest average city-wide accident rate is 4.6 ACC/MVM. SPEED7I0/TXTW.02M SPEED ZONE REPORT - urandywine Drive Page 2 ° CONCLUSION - The following posted speed limits are appropriate: Brandywine Drive Segment Posted Speed Limi t Ham Lane - Hutchins Street 3 5 mph There are no changes from the existing, posted speed limit. The recommended posted speed limits are b --sed on the 85th percentile speeds observed in the field. It is not recmended to further reduce the speed zones due to unexpected conditions or accident records. Jack L. Ronsko Public Works Directo JLR/nl SPEEDZIO/TXTW.02M 15, 4r ENGINEERING fa - I - a AND TRAFFIC SURVEY uj ul lu SEE NARRATIVE FOR BACKGROUND INFORMATION 2- 3t�. 4!� 41d 4-,d 4S6 ),I�k P'L + R` zt. i SPEED TABLE R0ADWX( WIDTH ------ NQ OF LANES —.- MEDIAN MPEI V,4 1 TRAFFIC SIGNAL DATA DAILY TRAFFIC i9ao16 70 AVERAGE OM SPEED- CRMCAt..e5`% g� SI If .... I !-_ &S --PACEM ss so 22-32[") :F6-36Ca-*J ZI-31(so) 25-35E 9 26 x6 Bis Ne 2?a 9/ /yW 26 .90 — EXWM SPEED ZONE — t!-- 25 - PROPOSED SPEED' ZONE t-- - LEGEN WPA SPEM GRAPH . FOR IN )RMATION ONEY w. 7: 7 "r -Mil uxam THIS IS A LOCAL.STRUT PER XQ ftl-Swsoo SEC 40802 (b). A STUDY IS 7 Fz- ) rvvImLwrscw&vw 7. ReMARED FOR RADAR ENFORCEINW. R39 -VWLD SOR cl c Im 7, *w vwT: TLW OF FbM ACCIDENT PLOT YR. 0 YR. ACCWENT=�EACCAXI vc)L-Wil —1 SPEED CITY OF: LODI 'CAUMMA L'ST ZONE PUBLIC WORKS DEPANTMEtr SURVEY SPEED ZONE REPORT - California Street August 1991 REFERENCE - Speed zone surveys are performed in the City of Lodi following State of California Gepartment of Transportation (Caltrans) guidelines in accordance with Section 40802(b) of the California Vehicle Code. These guidelines are outlined in Chapter 8 of the Caltrans Traffic Manual. ° STUDY Important factors to consider in determining the speed limit which i s most appropriate to facilitate the orderly movement of traffic and that is reasonably safe are prevailing speeds, unexpected conditions to drivers, and accident records. Prevailing Speeds (85th Percentile Speed - Reasonable speed limits contonn tote actual behavior ot t e majority of motorists, and by measuring motorists' speeds, one will be -able" t o select a speed limit that is both reasonable and effective. Speed limits should normally be established at the first five mile per hour increment below the 85th percentile speed. However, in matching existing conditions with the traffic safety needs of the community, engineering judgement rrlay indicate the need for a further reduction o f five miles per hour. Six radar surveys were performed and the 85th percentile ranged from 30 to 37 mph. Unexpected Conditions NMm roadside development results in traffic conflicts and unusual conditions which are not readily apparent to drivers, speed limits below the 85th percentile are warranted. The following factors were considered: roadway design speed, safe stopping sight distance, superelevation, shoulder conditions, profile condition, intersection spacing and offsets, commercial driveway characteristics, and pedestrian tragi ric in the roadway without sidewalks. There were no unexpected conditions used to further reduce the speed limit. Accidents Accident records of the two most recent years were considered in determining the speed zones. Accidents on segments of roadways are classified by their accident rate. Accident rates are determined by the number of accidents occurring within a segment of roadway and the traffic volume within that segment. Accident rates are shown in accidents per million vehicle miles (ACC/MVM) . The accident rate is 10.0 ACC/MVM between Lockeford Street and Turner Road. The latest average city-wide accident rate is 4.6 ACC/MVM. SPEEDZO7/TXTW.02M SPEED ZONE REPORT - California Street Page 2 0 CONCLUSION - The following posted speed limit is appropriate: California Street Segment Posted Speed Limit Lockeford Street -Turner Road 30 mph There are no changes from the existing posted speed limit. Based on the 85th percentile speeds observed in the field, the posted speed limit could be 30 or 35 mph. The accident rate is higher than average and therefore it is appropriate not to increase the speed limit. It is not recommended to further reduce the speed zone. due to unexpected conditions, Jack L. Ronsko Public Wcd<s Director JLR/nl SPEEDZ07/TXTW.02M ENGINEERING AND TRAFFIC SURVEY SEE NARRATIVE FOR BACKGROUND INFORMATION NOA LANES . AIED.— (TYPEl TRAFFIC SAMDATA. t�TCE txi WB Z/- / � 23-33 B6 -wEaAN w x Z5 - Z �G Z : PROMIWD-SPEEO.ZONE 1 L:ERGEND= wn ! i _ i l I ' R21') -SPEED UNT S MW W $ -TRAFFIC SIGMGI- . �GdilO1L SPEED � �-' .. -tDMFA LWT OF PACE :ACCCENT PLOT._-:,YRs YRi 19bY : ACCOENT RAE-ACC/A*l-VER>ML a. ........ CITY 4F LODI SPEED ' FILERS LN ZONE PUBLK WORKS DEPARWEW ! - SURVEY SPEED ZONE REPORT - Eilers Lane August 1991 ° REFERENCE - Speed zone surveys are performed in the City of Lodi following State of California Department of Transportation (Caltrans) guidelines in accordance with Section 40802(b) of the California Vehicle Code. These guidelines are outlined in Chapter 8 of the Caltrans Traffic Manual . U STUDY Important factors to consider in determining the speed limit which is most appropriate to facilitate the orderly movement of traffic and that is reasonably safe are prevailing speeds, unexpected conditions to drivers, and accident records. Prevailing Speeds (85th Percentile Speeds) - Reasonable speed limits contorrn tot e actual behavior ot tile majority of motorists, and by measuring motorists' speeds, one will be able to select a speed limit that is both reasonable and effective. Speed limits should normally be established at the first five mile per hour increment below the 85th percentile speed. However, in matching existing conditions with the traffic safety needs of the community, engineering judgement may indicate the need for a further reduction of five miles per hour. Four radar surveys were performed and the 85th percentile ranged from 29 to 31 mph as shown below: Unexpected Condi t i o n s NMm roadside development results in traffic conflicts and unusual conditions which are -not readily apparent to drivers, speed limits below the 85th percentile are warranted. The following factors were considered: roadway design speed, safe stopping sight distance, superelevation, shoulder conditions, profile condition, intersection spacing and offsets, commercial driveway characteristics, and pedestrian traffic in the roadway without sidewalks. There are no unexpected conditions used to further reduce the speed limit. Accidents Accident records of the two most recent years were considered i n determining the speed zones. Accidents on segments of roadways are classified by their accident rate. Accident rates are determined by the number of accidents occurring within a segment of roadway and the traffic volume within that segment. Accident rates are shown in accidents per million vehicle miles (ACC/MVM) . The accident rates is 2.5 ACC/MVM. The latest average city-wide accident rate i s 4.6 ACC/MVM. SPEEDZ09/TXTW.02M SPEED ZONE REPORT - Eilers Lane ° CONCLUSION Eilers Lane Segment Posted Speed Limit Woodmven lane - Lovr Sacramento Road 30 mph There are no changes from the existing posted speed limit. The recoarnerkled posted speed limits are based on the 85th percentile speds observed in the field. I t is not recormnended to further reduce the speed zones due to unexpected conditions or accident records. Jack L. Ronsko Public Wc& Director JLR/nl SPEED7.09/TXTW.02M ENGINEERING sitty �zsarrn. �c+n.c� ISY. I I SEE NARRATIVE FOR 4 N c m N a BACKGROUND INFORMATIOX a Ry_ N r +5od triT a 2boU uso' ,� �soi .'+ai aioc moo' nao 1 h +xd J. MU.4 oNc ui w�d€' G a 3 NAM Lel 5 Fs Mt f YiMt YtMt 1 Y. ml 'I SPE..rD TABLE 64-Sd-' v'+2t�5 .�.� 6a• - 5�ut,t=i£s•^i�— �o'---+-X56-�" ROADWAY WIDTH 4 _ — 2 ♦ LT A---. 1 WM OF LANES MEWAH rrYPE) �'ai3E0 COMG•.�`TE +•r"�r 8¢KTu.5TS0 26144WF0 ai5azzo ,p/'2 - TRAFFIC SM04AL DATA .. I4710 8kID; Bb /0490 (6905 ?23fzo AVERAGE DANY-TRAFRC 43 4z 38 08S SPEED-CRrDCAL. 6 ! 38 Nff -VA r 6 Z 3h 18¢ D 9/ -PACE o<) F B5 Z- BZ 3� •d0 B/ a - 3n -:—MEDIAN 50r% s EXM tHG-SPEED ZONE 33 MPH -t0 4T✓N • - —_ ai MPH 35NA✓ PROPOSED SPEED =HE J*5 •GOM>' ��---�:-" - - LEGEND- _- MPH. _ ._ ---. ...... —S** ROCdYCtt -- .. Rl RP( ) -9►EfL Jwr Sit R39-.—YiLD - "a8 c mwmw&%Rm .. AocmExrPLOT / 9 ! - 1 3 ! t z 3! 2/ z 3/ 1 z ,if I 'ILI t 3 i z I' T z ! z i 3 I/ s S I t YW / 9 ACCMXNr RATE Aa.�%IN. MG f . ! Z•o q.D Z•3 Z-7- CITY OF LODI :HAM LN SPEED ZONE "'' °1i"' °'•• PUUK WORKS DEPARTMENT .SURVEY . �,,,, &Rt _ ct SPEED ZONE REPORT - Ham Lane August 1991 REFERENCE - Speed zone surveys are performed in the City of Lodi following State of California Department of Transportation (Caltrans) guidelines in accordance with Section 40802(b) of the California Vehicle Code. These guidelines are outlined in Chapter 8 of the Caltrans Traffic Manual. STUDY Important factors to consider in determining the speed limit which is most appropriate to facilitate the orderly movement of traffic and that is reasonably safe are prevailing speeds, unexpected conditions to drivers, and accident records. Prevailing Speeds 85th Percentile Speeds) - Reasonable speed limits co Corm t4 The actual e avior ofthe majority of motorists, and by measuring motorists' speeds, one will be -able to select a speed limit that i s both reasonable and effective. Speed limits should normally be established at the first five mile per hour increment below the 85th percentile speed. However, in matching existing conditions with the traffic safety needs of the community, engineering judgement may indicate the need for a further reduction of five miles per hour. Twelve radar surveys were performed and the 85th percentile ranged from 36 to 43 mph as shown below: Street Segment Northbound Southbound Harney Lane - Century Boulevard 38 mph 36 mph Century Boulevard - Vine Street 39-41 mph 42-43 mph Vine Street - Turner Road 36-38 mph 38 mph Unexpected Conditions Wlrn roadside development results in traffic conflicts and unusual conditions which are not readily apparent to drivers, speed limits below the 85th percentile are warranted. The following factors were considered: roadway design speed, safe stopping sight distance, superelevation, shoulder conditions, profile condition, intersection spacing and offsets, commercial driveway characteristics, and pedestrian traffic in the roadway without sidewalks. There are no unexpected conditions used to further reduce the speed limit. SPEEDZ08/TXTW.02M SPEED ZONE REPORT - Ham Lane Page Accidents Accident records of the two most recent years were considered in determining the speed zones. Accidents OR segments of roadways are classified by their accident rate. Accident rates are determined by the number of accidents occurring within a segment of roadway and the traffic volume within that segment. Accident rates are shown in accidents per million vehicle miles (ACC/MVM). The accident rates ranged from 1.9 to 6.3 ACC/MVM. The latest average city-wide accident rate is 4.6 ACC/MVM. ° CONCLUSION - The following posted speed limits are appropriate: thn Lane Segment Posted Speed Limit Harney Lane - Century Boulevard 35 mph Century Boulevard - Vine Street 40 mph Vine Street - Turner Road 35 mph There are no changes from the existing posted speed limit. The reconnended posted speed limits are based on the 85th percentile speeds observed in the field. It is not recommended to further reduce the speed zones due to unexpected conditions or accident records. Jack L. Ronsko Pjjb 1 i c Wojks Director JLR/nl SPEEOZ08/TXTW.C2M ENGINEERING I G u N AUD TRAFFIC SPEED TABLE ROADVAY woo: 41d WIN r 1p �J SEE NARRATIVE FOR { J �r BACKGROUND INFORMATION R X N (( � K f 21 I {N { Rl ��• { tt ( iz' i ied . i1 z�35 80 XB � I K ' LOAiA DR z3 SPEED TABLE ROADVAY woo: 41d NM OF. LANES , MEDIAN (TYPE) NA TRAFFIC SIGNAL DATA" - -AVERAGE. DAILY TRAFFIC -. -OBS. 'SPEED-OMTWAL.85 --69 z6 . ,..:. XB :. PACE M) ..:... z�35 80 XB 19'23 EO ?8 38 ;t6 XS z3 3/ _ EXISTING SPEED ZD►.E . ,...._- _ 3O MPN MP PROPOSED SPEED ZONE:... g - . LcGEND! �w1+ •' t RI :SAa• SNA. „ � � � t ON Y-� . R39 vIEtD slat - •.. -. / � 3 _ P�P''sNOtORG C ..... _ .. � I O SNF `4 �0 .. -- -Fl N 17 ACCIDENT PLOT :. YRt . /990 t I AecroENE-AC.G/MCL 1 0 l r W VER -Mi. ,$ .. �. ...�... ....�, CITY OF LODI ... - COMA DR SPEED ZONE PUBUC wOs<KS DEPARt•_uEM SURVEY August 1991 SPEED ZONE REPORT - Goma Drive REFERENCE - Speed zone surveys are performed in the City of Lodi following State of California Department of Transportation (Caltrans) guidelines in accordance with Section 40802(b) of the California Vehicle Code. These guidelines are outlined in Chapter 8 of the Caltrans Traffic Manual. ° STUDY Important factors to consider in determining the speed limit which is most appropriate to facilitate the orderly movement of traffic and that is reasonably safe are prevailing speeds, unexpected conditions to drivers, and accident records. Prevailing Speeds (85th Percentile Speeds) - Reasonable speed limits conform to the actual behavior of the majority of motorists, and by measuring motorists' speeds, one will be able to select a speed limit that is both reasonable and effective. Speed limits should normally be established at the first five mile per hour increment below the 85th percentile speed. However, in matching existing conditions with the traffic safety needs of the community, engineering judgement may indicate the need for a further reduction of five miles per hour. Four radar surveys were performed between Elm Street and Turner Road and the 85th percentile ranged from 26 to 36 mph. Unexpe(ted Conditions When roadside development results in traffic conflicts and unusual conditions which are not readily apparent to drivers, speed limits below the 85th percentile are warranted. The following factors were considered: roadway design speed, safe stopping sight distance, superelevation, shoulder conditions, profile condition, intersection spacing and offsets, commercial driveway characteristics, and pedestrian traffic in the roadway without sidewalks. There are no unexpected conditions used to further reduce the speed limit. Accident records of the two most recent years were considered in determining the speed zones. Accidents on segments of roadways are classified by their accident rate. Accident rates are determined by the number of accidents occurring within a segment of roadway and the traffic volume within that segment. Accident rates are shown in accidents per million vehicle miles (ACC/MVM). The accident rate ranged from 10.0 to 12.7 ACC/MVM. The latest average city-wide accident rate is 4.6 ACC/MVM. It is recommended to further reduce the 85th percentile speeds due to the higher than average accident rate. SPEEDZI2/TXTW , 02t1 SPEED ZONE REPORT - Loma Drive Page ° CONCLUSION - The following posted speed limit is appropriate: Loma Street Segment Posted Speed Limit 11n Street - Turner Raod 30 mph There are no changes from the existing posted speed limit. Based on the 85th percentile speeds observed in the field and the higher than average accident rate, a 30 mph posted speed limit is appropriate. I t is not recommended to further reduce the speed limit due to unexpected conditans. Jack L. Ronsko o4R0�ESS/0.yo Publ is Wcd<s Director JLR/nl IN,�, In SPEEDZI2/TXTW.02M 5 3b 99 Tl3� C®Q2 ZZ 32 92 ZQ 75 -;PA EW`. Sg _ 75 s7 3G -6L GGi ZB38 2P 3� B? Y33319/) zi$!(e67 1FCI!?f' JD ENGINEERING NB � Y a C> z "' z o ad 1 AND TRAFFIC SURVEY -IAEDM SB .... - .. - S - 00 40 C p( /VB :'- ETttT11NGSPEED zONE.:.. - N `i5 1 • 7� Mpl•1 35 9D 'MPti -WRO MPH SEE NARRATIVE FOR P"m SPEED ZONE 1 BACKGROUND INFORMATION LEGEND . NPe+ y y lY9p� p � � 29od _ f � tei d sm PC, :� R2t.)-sno uWT 991 •. :. :'1 I t OCK70M Si i : N 1 ` fh Ml 1 h N1 I Ni Mf I I✓CMI t 4�Mi ( MI 5 3b 99 Tl3� C®Q2 ZZ 32 92 ZQ 75 -;PA EW`. Sg _ 75 s7 3G -6L GGi ZB38 2P 3� B? Y33319/) zi$!(e67 1FCI!?f' NB Z,!o ad -IAEDM SB .... - .. - S - 00 40 3Z 32 25 /VB :'- ETttT11NGSPEED zONE.:.. - `i5 1 • 7� Mpl•1 35 9D 'MPti -WRO MPH - P"m SPEED ZONE 1 LEGEND . NPe+ sm PC, :� R2t.)-sno uWT 991 •. :. :'1 i : I.t: �••�. batt TPAFnC WPM, . • ' ' �. r . 2 ! 2 r t Z. r ' 5 = ' pCC10ENT. PIAT-.. YR"/ -'YO I YR- /98 I .. 74 1 5-3 0 ACgOFMR/i<E-elrn.� yER-on.- 23 . SPEED - � CITY OF Lob STOCK ON ST .. ZUNI PUBItC WORKS DEPARTMENT .. .SURVEY . August 1991 SPEED ZONE REPORT - Stockton Street ° REFERENCE - Speed zone surveys are performed in the City of Lodi following State of California Department of Transportation (Caltrans) guidelines in accordance with Section 40802(b) of the California Vehicle Code. These guidelines are outlined in Chapter 8 of the Caltrans Traffic Manual. STUDY SPEEDZII/TXTW.02M Important factors to consider in determining the speed limit which is most appropriate to facilitate the orderly moveniat of traffic and :hat is reasonably safe are prevailing speeds, unexpected conditions to drivers, and accident records. Prevailing Speeds ( 85th Percentile Speeds) - Reasonable speed limits conform tote actual—behavior of the majority of motorists, and by measuring motorists' speeds, one will be able to select a speed limit that is both reasonable and effective. Speed limits should normally be established at the first five mile per hour increment below the 85th percentile speed. However, in matching existing conditions with the traffic safety needs of the community, engineering judgement may indicate the need for a further reduction of five miles per hour. i Fourteen radar surveys were performed and the 85th percentile ranged ' from 29 to 46 mph as shown below: :i Street Segment Northbound Southbound Barney Lane - Kettleman Lane 45-46 mph 44-45 mph i Kettleman Lane - Tokay Street 35-37 mph 37-39 mph Tokay Street - tockeford Street 29-30 mph 29 mph Lockeford Street - Turner Road 39 mph 39 mph Unexpected Ccnditions Vvbn roadside development results in traffic conflicts and unusual conditions which are not readily apparent to drivers, speed limits below the 85th percentile are warranted. The following factors were considered: roadway design speed, safe stopping sight distance, superelevation, shoulder conditions, profile condition, intersection spacing and offsets, commercial driveway characteristics, and pedestrian traffic in the roadway without sidewalks. There are no unexpected conditions used to further reduce the speed limit. SPEEDZII/TXTW.02M SPEED ZONE REPORT - Stockton Street ?age 2 Accident records of the two most recent years were considered i n determining the speed zones. Accidents on segments of roadways are classified by their accident rate. Accident rates are determined by the number of accidents occurring within a segment of roadway and the traffic volume within that segment. Accident rates are shown in accidents per million vehicle miles (ACC/MVM) . The accident rate ranged from 2.3 to 10.3 ACC/MVM. The latest average city-wide accident rate is 4.6 ACC/MVM. ° T - The following posted speed limits are appropriate: Stockton Street Segment Posted Speed Limit Harney Lane - Kettleman Lane 45 mph Kettleman Lane - Tokay Street 35 mph Tokay Street - Lockeford Street 30 mph Lockeford Street - Turner Road 35 mph There are no changes from the existing posted speed limit. The recommended posted speed limits are based m the 85th percentile speeds observed in the field. It is not recommended to further reduce the speed zones due to unexpected conditions or accident records. Jack L. Ronsko Public Wojks Director JLR/nl SPEEDZ11/TXTW.02M RESOLUTION NO. 91-146 RESOLUTION OF THE LODI CITY COUNCIL., A TRAFFIC RESOLUIION 87-163, AND THEREBY APPROVJMG SPED LIMITS ON KETTLEMAN LANE BETWEEN F1Lif1WAY 99 NORTHBOUND RAM'S AND EAST CITY LIMIT RESOLVED, that the City Council of the City of Lodi does hereby amend Traffic Resolution No 87-163, Section 7 - Speed Limits, to approve speed limits on Kettleman Lane between Highway 99 northbound ramps and East City Limits as shown on Table 1, attached hereto. Dated: August 7, 1991 I hereby certify that Resolution 1% 91-146 was passed and adopted by the Lodi City Council in an adjourned regular meeting held August 7, 1991 by the following vote: Ayes: Council Members - Pennino , Pinkerton, Si eglock, Snider and Hinchman (Mayor) Noes: Council Members - None Absent: Council Members - None AU4R #ZLtk _ City Clerk 91-146 Table 1 Street - Segment Brandywine Drive Ham Lane -Hutchins Street California Street Oak Street- Lockeford Street Lockeford Street -Turner Road Eilers Lane Woodhaven Lane -Lower Sacramento Road Ian Lane Harney Lane-Centruy Boulevard Centruy Boulevard -Vine Street Vine Street -Turner Road Loma Drive Elm Street -Turner Road Stockton Street Harney Lane-Kettleman Lane Kettleman Lane-Tokay Street 'P-1,. f -6-4-A 04,--04 CTRRFF34/TXTW.02M (CO -COM) 1� Posted Sneed Limit 35 mph 25 mph 30 mph 30 mph 35 mph 40 mph 35 mph 30 mph 45 mph 35 mph 30 mph 35 mph 40 mph 35 mph July 31, 1991