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 City of Dania Beach - SE 5thAvenue Traffic Calming Study - Draft
 

City of Dania Beach - SE 5thAvenue Traffic Calming Study - Draft

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     City of Dania Beach - SE 5thAvenue Traffic Calming Study - Draft City of Dania Beach - SE 5thAvenue Traffic Calming Study - Draft Document Transcript

    • CITY OF DANIA BEACH SE 5TH AVENUE TRAFFIC CALMING STUDY DRAFT VERSION JANUARY 2011 Prepared by: 500 Cypress Creek Road, Suite 410 Ft. Lauderdale, FL 33309 954.730.0707
    • TABLE OF CONTENTS1. INTRODUCTION .................................................................................................. 1-12. DATA COLLECTION ........................................................................................... 2-1 2.1 Traffic Data.................................................................................................... 2-13. DATA ANALYSIS................................................................................................. 3-1 3.1 Traffic Calming.............................................................................................. 3-1 3.1.1 Traffic Thresholds............................................................................ 3-1 3.1.2 Traffic Calming Evaluation ............................................................. 3-2 3.1.3 Traffic Calming Options .................................................................. 3-24. APPROACH & CONCEPTUAL PHASING PLAN.............................................. 4-1 4.1 Approach........................................................................................................ 4-1 4.2 Conceptual Phasing Plan................................................................................ 4-1City of Dania Beach ii January 2011SE 5th Avenue Traffic Calming Study - DRAFT
    • LIST OF FIGURESFigure 1-1: Study Location MapFigure 2-1: Traffic Data Collected for Study AreaFigure 2-2: Existing Traffic Calming DevicesFigure 4-1: Conceptual Traffic Calming Plan LIST OF TABLESTable 2-1: Summary of Volumes CollectedTable 2-2: Summary of Speeds CollectedTable 3-1: Volume Threshold for Local StreetsTable 3-2: Broward County Traffic Calming GuidelinesTable 3-3: City of Coral Springs Traffic Calming Evaluation CriteriaTable 3-4: Level 1 Psychological Traffic Calming OptionsTable 3-5: Level 2 Physical Traffic Calming OptionsCity of Dania Beach iiii January 2011SE 5th Avenue Traffic Calming Study - DRAFT
    • 1. INTRODUCTIONThe City of Dania Beach requested a traffic calming study of SE 5th Avenue betweenSheridan Street and Dania Beach Boulevard to address local neighborhood trafficcomplaints of excessive speeds by motor vehicles. Under the original traffic calmingstudy performed by Kimley-Horn and Associates, Inc., roundabouts were recommendedto reduce motor vehicle speeds. These roundabouts require a large amount of right-of-way and therefore are not favored by the stakeholders. At the request of the City, Chenand Associates has assessed other traffic calming options for SE 5th Avenue which arepresented in this report. The options were evaluated for the following criteria: • Impact to adjacent neighborhood streets; • Effectiveness in addressing excessive speeds; • Impact to adjacent residents; and • Cost of implementation. Figure 1-1: Study Location MapCity of Dania Beach 1-1 January 2011SE 5th Avenue Traffic Calming Study - DRAFT
    • 2. DATA COLLECTION2.1 Traffic DataThe traffic data collected was used for determining whether SE 5th Avenue warrantstraffic calming treatment. Traffic volumes and speeds were collected for both directionsof travel for the roadway in question during a typical weekday.Broward County Traffic Engineering staff collected traffic data with the Nu-MetricsTraffic Analyzer. The equipment was installed on SE 5th Avenue north of SE 7th Street asillustrated in Figure 2-1. The device recorded both volume and speed data at thislocation. A summary of the traffic volumes collected for a 24-hour period is presented inTable 2-1. Figure 2-1: Traffic Data Collected for Study Area Table 2-1: Summary of Volumes Collected Location Functional Volume Classification1 (veh/day) SE 5th Avenue – North of SE 7th Street City Collector 7,700 Notes: (1) Roadway classification according to Broward County Highway Functional Classifications.City of Dania Beach 2-1 January 2011SE 5th Avenue Traffic Calming Study - DRAFT
    • Traffic data was evaluated as listed below: 1. Determine if volume/speed thresholds were exceeded; 2. Assess the existing traffic conditions in the study area; and 3. Evaluate the traffic patterns.The traffic data collected included traffic volumes and speeds. Additionally, existingtraffic calming devices located within the residential neighborhood were identified andpresented in Figure 2-2. Existing conditions and related study results are provided inTable 2-1 and 2-2. Figure 2-2: Existing Traffic Calming DevicesA summary of average and 85th -percentile speeds is presented in Table 2-2 below. The85th-percentile speed is the speed below which 85 percent of the motorists are travelingand is often used as a measure of the upper limit of “reasonable” speeds for the prevailingconditions. A complete summary of the traffic thresholds is presented in Section 3.1.1. Table 2-2: Summary of Speeds Collected Location Posted Speed Average 85th – Percentile 85th Percentile Safety Limit Speed Speed Speed Above Posted Concern1 (mph) (mph) (mph) Speed Limit SE 5th Avenue – 30 36 41.41 11.41 Excessive North of 7th Street1 Safety concern thresholds established in the Broward County Neighborhood Traffic Management Manual.City of Dania Beach 2-2 January 2011SE 5th Avenue Traffic Calming Study - DRAFT
    • 3. DATA ANALYSISThe data collected, as described in Section 2, was evaluated and analyzed againststandard traffic thresholds and options. The results are presented below:3.1 Traffic Calming3.1.1 Traffic ThresholdsBroward County Traffic Engineering reviews and monitors traffic conditions throughoutthe County and is the governing agency for traffic related matters. Broward Countyprovides guidance in the Broward County Neighborhood Traffic Management Manual forwhen neighborhood traffic management (such as the installation of traffic calmingdevices) should be considered2. As listed in Broward County Neighborhood TrafficManagement Manual, neighborhood traffic volume thresholds for local streets aredefined as follows: Table 3-1: Volume Threshold for Local Streets Traffic Flow (vehicles/day) Environment Below 500 Low Traffic Volume 501-1,000 Low to Moderate Traffic Volume 1,001-1,500 Moderate to High Traffic Volume Over 1,500 High Traffic VolumeCriteria for determining when vehicular speeds warrant consideration of traffic calmingdevices is based on the determination of the 85th-percentile speed, as defined in Section2.1. According to the Broward County Guidelines: Table 3-2: Broward County Traffic Calming Guidelines If the 85th-percentile speed is… Recommendations Less than 5 mph above the posted speed limit Minimal Concern - measures may not be necessary Between 6 and 10 mph above the posted speed limit Moderate Concern - measures should be considered 11 mph or more above the posted speed limit Excessive Concern - measures should be taken to solve the problemIn review of other Broward County municipality criteria, the City of Coral Springsestablished evaluation criteria3 used to gauge whether a traffic calming study areawarrants possible traffic calming treatment. Speed and volume thresholds for CoralSprings are shown in Table 3-3. By summing volume and speed criteria points, anystreet that ranks 2.5 or higher warrants traffic calming treatment, upon approval of theCity’s Traffic Engineering Consultant:2 Broward County Neighborhood Traffic Management Manual (p.13-14)3 City of Coral Springs Traffic Calming Manual – approved June 2002 (p.6)City of Dania Beach 3-1 January 2011SE 5th Avenue Traffic Calming Study - DRAFT
    • Table 3-3: City of Coral Spring Traffic Calming Evaluation Criteria Points 85th speed is… above speed limit 0.5 Less than 4.6 mph Points 24 hr. volume 1.0 4.6 to 7.5 mph 0.5 500-1,100 vehs 1.5 7.6 to 10.5 mph 1.0 1,101-1,700 vehs 2.0 10.6 to 13.5 mph 1.5 1,701-2,300 vehs 2.5 13.6 to 16.5 mph 2.0 More than 2,300 3.0 More than 16.5 mph3.1.2 Traffic Calming EvaluationBased on the criteria specified in the Broward County Neighborhood TrafficManagement Manual, traffic speed on SE 5th Avenue is excessive. As data collectedillustrates, the 85th percentile exceeds 11mph; the data also verified that this is a highvolume street for its classification. Where excessive traffic volumes and speeds areobserved on local streets in residential neighborhoods, traffic calming improvements mayaid in notifying motorists that they are in a residential environment thereby helpingachieve a reduction in speeds and improvement in the neighborhood’s livability andquality of life.3.1.3 Traffic Calming OptionsTraffic calming options can be generally classified under two categories: psychological(i.e. Level 1) and physical (i.e. Level 2): • Level 1 – Psychological Traffic Calming Options These measures are generally comprised of public involvement, enforcement efforts, striping, signage, and the use of the speed radar trailer. See Table 3-4. • Level 2 – Physical Traffic Calming Options These measures generally require the alteration of the physical configuration of neighborhood streets. These measures are sometimes referred to as “physical controls.” Common characteristics of these controls are that they force or prohibit specific actions. These features are largely self-enforcing and may create a visual impression that a street is not intended for through traffic. Level 2 treatments include chokers, medians, raised intersections, and speed humps, among others. See Table 3-5 for a list of Level 2 options. While these measures have the potential to achieve the desired results, they can also present significant problems that compound the initial resident concerns. Problems can include: Emergency response impact Increase noiseCity of Dania Beach 3-2 January 2011SE 5th Avenue Traffic Calming Study - DRAFT
    • Table 3-4: Level 1 Psychological Traffic Calming Options Volume Speed Emergency Vehicle Treatment Reduction Reduction Noise Response Impact Cost Striping Narrower Lanes / Centerline Delineation Possible Yes No Change None $3/ linear footSpeed Radar Trailer or Sign No Yes No Change None $10k Pavement Messages No Possible No Change None $300 per SignIncrease Police Enforcement Possible Yes No Change None N/A Table 3-5: Level 2 Physical Traffic Calming Options Volume Speed Emergency Vehicle Treatment Reduction Reduction Noise Response Impact Cost Speed Humps Possible Yes Increase Yes $2-$4k per hump Short Medians No Yes No Change None $5-$15k per location Raised Crosswalks No Yes Increase Yes $4-$8k per location Raised Intersection No Yes Possible None $15-$25k per locationTextured Pavements No Yes Possible None (varies) Chicanes No Yes Possible Yes $5-$10k per locationChokers / Bump-outs Possible Yes No Change Yes $7-$10k per location Rumble Strips No Yes Increase None $750 per location City of Dania Beach 3-3 January 2011 SE 5th Avenue Traffic Calming Study - DRAFT
    • 4. APPROACH & CONCEPTUAL PHASING PLAN4.1 ApproachCurrent conditions in the SE 5th Avenue corridor warrants a review of implementingtraffic calming measures based on the evaluation of data collected against current trafficcalming guidelines. However, no traffic calming devices should be installed permanentlywithout seeking comments and opinions of residents directly affected by the proposedmeasures. We highly recommend involving the stakeholders in this traffic calmingprocess.Hold a community meeting to discuss the alternative traffic calming plansMeetings with the community should be held to present the alternative traffic calmingplans and solicit input and comments from all affected and interested parties. Negativeimpacts must be identified and then weighed against the benefits of any proposed trafficcalming option.Evaluate the alternatives and select a traffic calming planThe preferred resident/city staff traffic calming measures should be evaluated foreffectiveness. Upon approval, Chen and Associates can develop implementation planswhich can include design plans. The design must be in conformance with regulatorycriteria, obtain regulatory approval, and construct improvements.4.2 Conceptual Phasing PlanThe goal of this traffic calming study is to address excessive vehicle speeds on SE 5thAvenue. The following traffic calming alternative is recommended since the measureswould not physically restrict mobility, yet would provide a measure of traffic calmingintended to reduce speeds along SE 5th Avenue. This study proposed the followingphased approach:Phase I – Install medians at the south and north end of SE 5th Avenue and incorporate thefollowing Level 1 measures: • Stripping narrower lanes (opportunity to enhance bike path), including double yellow center stripping.The medians will allow for the installation of neighborhood identification signs. It marksthe entrance to the neighborhood and helps to communicate a sense of neighborhoodidentity.Phase 2 – After Phase I is complete, field traffic data should be collected to determine theeffectiveness and any impacts to interior streets. After a period of 60 days, shouldtreatment prove unsatisfactory resolving the concern or should the perceived concernpersist, additional treatment should be considered. Considering the recently completedlinear park and neighborhood characteristics, raised intersections at SE 3rd Street and SE10th Street would be the recommended traffic calming treatment.City of Dania Beach 4-1 January 2011SE 5th Avenue Traffic Calming Study - DRAFT
    • Figure 4-1: Conceptual Traffic Calming PlanCity of Dania Beach 4-2 January 2011SE 5th Avenue Traffic Calming Study - DRAFT