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HomeMy WebLinkAboutAgenda Report - August 1, 2007 E-11AGENDA ITEM -wil 4Q CITY OF LODI W.i COUNCIL COMMUNICATION TM AGENDA TITLE: Adopt Resolution Amending Traffic Resolution 97-148 by Approving a Reduction of Speed Limit on Lower Sacramento Road from South City Limits to 1,300 Feet South of Kettleman Lane from 55 Miles per Hourto 50 Miles per Hour MEETING DATE: August 1,2007 PREPARED BY: Public Works Director RECOMMENDEDACTION: Adopt a resolution amending Traffic Resolution 97-148 by approving a reduction of the speed limit on Lower Sacramento Road from the south City limits to 1,300feet south of Kettleman Lane from 55 miles per hour (mph) to 50 mph, as shown on the attached Engineering and Traffic Survey (ExhibitA). BACKGROUND INFORMATION: Perthe California Vehicle Code (CVC), Engineering and Traffic Surveys must be updated a minimum of every five years on all "non -local" streets. "Non -local" streets are collector and arterial streets included in the Federal Aid System. Streets with surveys that have exceeded five years cannot be radar enforced. The Police Department relies on these surveys not only for speed enforcement purposes, but for use in the courtroom in the event of a dispute from the person cited. The establishmentof speed limits is also coordinated with the Police Department due to their field and enforcement expertise. In accordance with CVC Section 40802 (b), Engineering and Traffic Surveys are performed following the California Manual on Uniform Traffic Control Devices (MUTCD). The i m portant 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 (85th Percentile Speedsl - Reasonablespeed 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 nearest 5 mph incrementto the 85th percentile speed. However, in matching existing conditionswith the traffic safety needs of the community, engineeringjudgment may indicate the need for a further reduction of 5 mph. Accidents -Accident recordsfor the two most recentyears are considered in determining 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 (ACCIMVM). The average Citywide accident rate is 3.3 ACC/MVM. APPROVED: / Blair King -,City Manager K =MTRAFFIMC Lower Sac Speed Survey 2007 doc 7/19/2007 Adopt Resolution Amending Traffic Resolution 97-148 by Approving a Reduction of Speed Limit on Lower Sacramento Road from South City Limits to 1,300 Feet South of Kettleman Lane from 55 Miles per Hour to 50 Miles per Hour August 1,2007 Page 2 Unexpected Conditions — Highway, traffic, and roadside conditions not readily apparent to the driver are also considered. When roadside development results in traffic conflicts and unusual conditions which are not readily apparent to drivers, speed limits below the 85th percentile may be justified In addition to the three primary factors described above, the following characteristics are also considered: • Residential density • Pedestrian and bicycle safety • Roadway design speed • Safe stopping sight distance • Superelevation • Shoulder conditions • Profile condition • Intersection spacing and offsets • Commercial driveway characteristics Pedestrian traffic in the roadwaywithout sidewalks DISCUSSION/RECOMMENDATION: The entire length of Lower Sacramento Road within the City limits was recently studied. The only recommended speed limit change on Lower Sacramento Road is on the portion between Harney Lane and Kettleman Lane that was recently added to the City with the Southwest Gateway Annexation. This portion of roadway, as well as the portion south of Harney Lane within San Joaquin County, has a prima facia speed limit of 55 mph. Although the vehicles speeds recorded and low accident rate support a 55 mph speed limit, because the roadway has bike lanes and lacks sidewalks for pedestrians, we recommend a speed limit reduction. Based on these factors, we recommend City Council approve a 50 mph speed limit on the portion of Lower Sacramento Road from the south City limits (Harney Lane) to 1,300 feet south of Kettleman Lane, as shown on Exhibit A. The speed limit on all other portions of Lower Sacramento Road will remain unchanged. A map showing speed limits in the City is attached as Exhibit B. FISCAL IMPACT: Not applicable FUNDING AVAILABLE: Fundingfor installation of speed limit signs and pavement legendswill come from the Measure K funds at an approximate cost of $3,430. L rk Oaris, Budget Manager Prepared by Rick S. Kiriu, Senior Engineering Technician RCP/RSKIpmf Attachments cc: City Attorney SeniorTraffic Engineer Streets and Drainage Manager Police SergeantCariilo Richard C. Prima, Jr. Public Works Director Police Chief Management Analyst Areida City Engineer/Deputy PublicWorks Director K:IWPITRAFFI=Lower Sac Speed Survey 2007,doc 711912007 June 2007 SPEED ZONE REPORT - Lower Sacramento Road, South City Limits to North City Limits ° REFERENCE - Speed zone surveys are performed in the City of Lodi following the California MUTCD in accordance with Section 40802 (b) of the California Vehicle Code. ° STUDY CRITERIA - 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 (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 nearest five mile per hour (mph) increment to the 85th percentile speed. However, in matching existing conditions with the traffic safety needs of the community, engineering judgment may indicate the need for a further reduction of five mph. Accidents — Accident records for two 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 average Citywide accident rate is 3.3 ACC/MVM. Unexpected Conditions — Highway, traffic, and roadside conditions not readily apparent to the driver were considered. When roadside development results in traffic conflicts and unusual conditions which are not readily apparent to drivers, speed limits below the 85th percentile may be justified. Other Factors — The following factors were considered: residential density, pedestrian and bicycle safety, 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. ° STUDY RESULTS Sixteen radar surveys were performed and the 85th percentile speeds ranged from 40 to 58 mph as shown below: Street Segment South City Limits to Century Boulevard Century Boulevard to Kettleman Lane Kettleman Lane to Vine Street Vine Street to Tokay Street Tokay Street to Lodi Avenue Lodi Avenue to Elm Street Elm Street to Turner Road Turner Road to North City Limits Northbound 58 mph 50 mph 50 mph 46 mph 46 mph 48 mph 50 mph 40 mph Southbound 56 mph 56 mph 48 mph 43 mph 49 mph 52 mph 53 mph 41 mph South City Limits to Century Boulevard The 851h percentile speeds on this segment are 56 and 58 mph. The 501h percentile speeds are 50 and 51 mph. This segment was recently acquired from the County with the Southwest Gateway Annexation. The current speed limit on this portion of roadway is a prima facia limit of 55 mph. The accident rate of 0.4 is below the Citywide average. No previous accident rate information was available. Based solely on the 85th percentile speeds, the speed limit could be posted at 55 mph; however, due to the lack of sidewalks for pedestrians and bicycle safety, we recommend a 50 mph speed limit along this segment. Century Boulevard to Kettleman Lane The 851h percentile speeds on this segment are 50 and 56 mph. The 501h percentile speeds are 46 and 50 mph. The accident rate of 0.9 is below the Citywide average. No previous accident rate information was available as the southern half of this segment was recently acquired from the County with the Southwest Gateway Annexation. The southern portion is rural in nature and has a current prima facia speed limit of 55. The northern half of this segment has a current posted and design speed of 45 mph due to the existing retail development on the east side of the roadway. Based solely on the 85th percentile speeds, the speed limit could be posted 50 mph; however, due to the 45 mph design speed, commercial driveway spacing, and bicycle safety, we recommend retaining the 45 mph speed limit along the northern half of this segment. Based on 85th percentile speeds and rural nature, a 50 mph speed limit is recommended on the south half of this segment. Kettleman Lane to Vine Street This portion of Lower Sacramento Road is comprised of two segments. Only the segment between Vintner's Square/Sunwest Market Place and Vine Street was long enough to survey vehicle speeds. The 85th percentile speeds on this segment are 48 and 50 mph. The 50th percentile speeds are 42 and 44 mph. The highest accident rate of 1.7 on these segments is below the Citywide average and lower than the 2.5 rate from the 2003 survey. Based solely on 85th percentile speeds, the speed limit on this segment could be posted at 50 mph; however, based on the reduced accident rate at the current speed limit, pedestrian and bicycle safety, we recommend retaining the 45 mph speed limit along this segment. Vine Street to Tokav Street The 85th percentile speeds on this segment are 43 and 46 mph. The 50th percentile speeds are 39 and 41 mph. The accident rate of 0.2 on this segment is below the Citywide average and lower than the 1.3 rate from the 2003 survey. Based on the 85th percentile speeds, continuing low accident rate at the current speed limit, and bicycle safety, we recommend retaining the 45 mph speed limit along this segment. Tokay Street to Lodi Avenue The 851h percentile speeds on this segment are 46 and 49 mph. The 501h percentile speeds are 41 and 44 mph. The accident rate of 0.9 on this segment is below the Citywide average and lower than the 1.4 rate from the 2003 survey. Based on the 851h percentile speeds, continuing low accident rate at the current speed limit, and bicycle safety, we recommend retaining the 45 mph speed limit along this segment. Lodi Avenue to Elm Street The 851h percentile speeds on this segment are 48 and 52 mph. The 501h percentile speeds are 43 and 47 mph. The accident rate of 0.3 on this segment is below the Citywide average and slightly lower than the 0.4 rate from the 2003 survey. Based solely on the 85th percentile speeds, the speed limit could be posted at 50 mph; however, based on the continuing low accident rate at the current speed limit, and bicycle safety, we recommend retaining the 45 mph speed limit along this segment. Elm Street to Turner Road The 85th percentile speeds on this segment are 50 and 53 mph. The 50th percentile speeds are 45 and 47 mph. The accident rate of 0.3 on this segment is below the Citywide average and slightly lower than the 0.4 rate from the 2003 survey. Based solely on 85th percentile speeds, the speed limit could be posted at 50 mph; however, based on the continuing low accident rate at the current speed limit and bicycle safety, we recommend retaining the speed limit 45 mph along this segment. Turner Road to North City Limits The 85th percentile speeds on this segment are 40 and 41 mph. The 50th percentile speed is 36 mph. The accident rate of 1.6 on this segment is below the Citywide average and lower than the 2.7 rate from the 2003 survey. Based solely on 85th percentile speeds, the speed limit on this segment could be posted at 40 mph; however, based on the reduced accident rate at the current speed limit, pedestrian and bicycle safety, we recommend retaining the speed limit of 35 mph along this segment. ° CONCLUSION The recommended speed limits are shown below: Segment South City Limits to Century Boulevard Century Boulevard to 1,300' South of Kettleman Lane 1,300' South of Kettleman Lane to Kettleman Lane Kettleman Lane to Vine Street Vine Street to Lodi Avenue Lodi Avenue to Elm Street Elm Street to Turner Road Turner Road to North City Limits Paula J. Fernandez Senior Traffic Engineer Posted Speed Limit 50 mph 50 mph 45 mph (no change) 45 mph (no change) 45 mph (no change) 45 mph (no change) 45 mph (no change) 35 mph (no change) y OFA OF LODI PUBLIC WORKS DEPARTMENT EXHIBIT B POSTED SPEED LIMITS V J s d 7 NOTE: The speed limits shown on this map are in miles per hour. The speed limit on streets within the City not shown on this map are 25 miles per hour. I LEGEND STREET WITH SPEED ZONE (NON -LOCAL STREET) "LOCAL" STREET WITH �a SPEED ZONE (VC 40802) RESOLUTION NO. 2007-153 A RESOLUTION OF THE LODI CITY COUNCIL APPROVING A REDUCTION OF THE SPEED LIMIT ON LOWER SACRAMENTO ROAD FROM SOUTH CITY LIMITS TO 1,300 FEET SOUTH OF KETTLEMAN LANE FROM 55 MILES PER HOUR TO 50 MILES PER HOURAND THEREBY AMENDING TRAFFIC RESOLUTION NO. 97-148 WHEREAS, per §40802(b) of the California Vehicle Code, in order to radar enforce vehicle speeds on this portion of Lower Sacramento Road, a valid Engineering and Traffic Survey must exist; and WHEREAS, Engineering and Traffic Surveys were performed based upon the State of California Department of Transportation (Caltrans) guidelines; and WHEREAS, the surveys include a map showing the physical characteristics of the roadway, such as roadway width, number of through lanes, and traffic controls. Traffic volumes, prevailing speeds, and accidents are analyzed and the results are provided in a written narrative for each street; and WHEREAS, three factors are considered when determining speed limits. They are as follows: 1) Prevailing Speeds (85"' Percentile Speeds): 2) Accidents; and 3) Unexpected Conditions; and WHEREAS, the portion of Lower Sacramento Road from the south City limits to 1,300 feet south of Kettleman Lane was recently added to the City with the Southwest Gateway Annexation and currently has a primafacia speed limit of 55 miles per hour: and WHEREAS, the Public Works Department recently performed an Engineering and Traffic Survey on Lower Sacramento Road from the south City limits to 1,300 feet south of Kettleman Lane and recommends approval of the speed limit of 50 miles per hour. NOW, THEREFORE, BE IT RESOLVED that the Lodi City Council hereby approves a reduction of the speed limit on Lower Sacramento Road from the south City limits to 1,300 feet south of Kettleman Lan from 55 miles perhojjr4o 50 ales -per --hour- and BE IT FURTHER RESOLVED that the City of Lodi Traffic Resolution No. 97-148, Section 7, "Speed Limits," is hereby amended by designating the 50 mile per hour speed limit on Lower Sacramento Road from the south City limits to 1,300 feet south of Kettleman Lane. Dated: August 1,2007 hereby certify that Resolution No. 2007-153 was passed and adopted by the City Council of the City of Lodi in a regular meeting held August 1,2007, by the following vote: AYES: COUNCIL MEMBERS— Hansen, Hitchcock, Katzakian, Mounce, and MayorJohnson NOES: COUNCIL MEMBERS — None ABSENT COUNCIL MEMBERS — None ABSTAIN: COUNCIL MEMBERS — None RANDIJOHL City Clerk 2007-153