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Home My WebLink AboutExhibit 3APPENDIX B TRAFFIC CALMING STUDY PUBLIC INVOLVEMENT Cty of Miamionsas Traffic Calming Study The Shenandoah Neighborhood What is Traffic Calming Types of Measures Alternatives Effectiveness of Measures Process The Neighborhood Functional Classification Traffic Data Collection Existing Problems Residents' Concerns 2 'Physical retrofit of traffic operations and anagement strategies on existing streets, signed to reduce adverse traffic impact such s speeding and excessive volumes and to prove safety and amenity." 3 -e- Passive Control Measures Least restrictive Do not physically prevent an action Easily violated by drivers Active Control Measure Most restrictive Physically prevent an action Create visual impression that streets are not only for motorists 4 • Full & Partial Closures •• Diveners • Median Barriers Forced Turn Islands - Roundabouts - Mini Roundabouts • Chicanes • Alternate Side Parking • Speed Humps/Tablet - Raised Crosswallcs • Raised intersections• - Speed Cushions. Realigned intersection • Center Island Medians • 5 • Curb -Extensions • Neckdo‘vris • ChOkers Slows Points • Gateways • ped ftefuge Islands • On -Street Parldng • Bicyde Lanes Narrowed Lanes • Streetscaping - Speed Gun w/VMS • Special Signs • Forced Perspective • Rumble Strips • Rumble Stripes • Color Pavement ▪ Textured Pavement • Textured Marldngs VOLUME CONTROL'MEASURES SPEED CONTROL -MEASURES - .Street Closures (Full / Partial) Semi-Diverters at intersections Diagonal Diverters • Median Barriers Forced Turn Channelization Restrictive one-way street .patterns -Right-in Right -out Diverters 6 Speed Humps and Speed Tables Traffic Circles and Roundabouts Mid -Block Medians Chicanes Narrowings at Mid -block and Intersection (choker/Neckdowns) Brick Pavers Central Island Narrowing Horizontal Alignment Changes Landscaping 'vantages: stricts all through enforcing isadvantages: redirect traffic to er local streets increase trip length or some drivers increase ergency response es Gainesville. FL 7 VOLUME CONTROL MEASURES vantages educes cut -through traffic estricts movements while iaintaining access for ssidents if enforcing and sthetically pleasing educes crossing distance for edestrians ergency vehicles can travel e restricted direction g antages ►everts traffic to parallel atreets. ncreases trip length for some residents restrict curbside parking '4acentto the device creases emergency sponse time Maintenance responsibility VOLUMECONTROL MEASURES San ose_ C._\ 8 dvantages: ective in reducing the speed uces accident potential and severity' uces conflict points rovides orderly and continuous flow affic flows Aesthetically appealing with andscaping vantages be restrictive for some large mergency and service vehicles equires safety and directional signs cause Toss of some parking aces near the intersection very safe for bicyclists unless 'cycle facilities are provided applicable for many residential treet intersections due to space requirements Boulder. C 9 SPEED CONTROL MEASURES Coral Gabies.: L 'vantages: Effective in reducing speed educes accident potential & verity educes conflict points �ovides orderly & continuous flow raffic`flows esthetically appealing when andscaped vantages: �y be restrictive for some large ergency and service vehicles wires safety and directional ns cause Toss of parking spaces ear intersection of very safe for bicyclists unless Eicycte facilities are provided �t.applicable for many residential feet intersections due to space equirements Be ,e6t n. OR 10 PEED CONTROL MEASURES Tallahassee. FL vantages: sthetically appealing uces pedestrian crossing nce educes speed without L nificantly impacting ergency response tsadvantages: ensive 11 ►-PEED 'CDN7 ROt MEASURES ges: rovides landscaping ortunities iscourages traffic from ontinuing through residential streets ws traffic eaks up sight -lines on fight street vantages: ay direct traffic to other sidentiaf streets irfy•expensive 12 SPEED CONTROL MEASURES T to iortens pedestrian ssing distance ates added street ndscaping area iscourages truck entry es: ►vantages: ,cause inconvenience to cal users affect bicycle mobility lsafety of very effective in reducing geed cause loss of some side parking require reworking of ace drainage 13 EED CONTROL MEASURES eed Hump /Choker tverter-Closure ral Island/Neckdown ised Intersection eckdown central Island/Choker ntral Island/Speed Table ised Crossing/Choker • al Island/Speed Hump :Lb P.n, 14 is-rund I'Vontgamer.:k ,Ctlunt)- Circles arrowings Half Closures Diverters lice; Institute of Transportation Engineers 15 urce: Institute of Transportation Engineers 16 Average Change Percent in Volume Change Change In Collision Frequency nterationaxperience; Traffic Speed Stop Circles Chicanes Narrcwings Humps Signs (3) (2) (1) (14) (3) Multiple (25) Speed Limit Refuges Reductions (2} (2) Source: E. Geddes et al, Safety Benefits of Traffic Calming, Insurance Corporation of British Columbia, Vancouver, 1996, p. 38. as (U.S. Experience) Avg. Annual Collisions Before After Change 2'Humps 50 2.6 2.3 -13% 4' Humps 5 4.4 2.6 -40% 22' Tables 8 6.7 3.7 -45% Circles w/o Seattle 17 5.9 4.2 -28% II Circles 130 2.2 0.6 _71% Overall 163 2.5 1.2 -51% Exclude Seattle 80 3.8 2.7 -25% Source: Institute of Transportation Engineers 18 NO Na Residents Concerns - Petition Problem Identification Street Network Classification Are Streets City Collectors or Residential Streets? YES YES Data Collection 19 GENERAL REQUIREMENTS & CONSTRAINTS • Limited to city residential collectors & local residential streets. • Posted speed limit between 30 & 35 mph. • Limited to streets with only two lanes of travel. • Streets are not a primary emergency routes. • May not be installed if curves streets would create an unsafe condition. • Streets are not a truck route. • No adverse effect pedestrians and/or bicycles safety. • No adverse effect street drainage. Traffic Volume* > 3,000 vpd 85th Percentile Speed > 5 mph over posted Speed Limit Cut -Through Traffic > 40% Pedestrian Volume > 25 pph Accidents > 6/year NO Traffic Volume* > 1,000 vpd 85th Percentile Speed > 5 mph over posted Speed Limit Cut -Through Traffic > 25% Pedestrian Volume > 15 pph Accidents > 3/year 20 * Volume/Speed Trade-off If the 85th Percentile Speed is greater than 5 mph over posted Speed Limit, for every 1 mph difference, 200 vpd should be added to the existing daily traffic volume. Remove the Device and Test Another 4---NO YES Identify Traffic Calming Alternatives Project Scoring and Ranking Installation of Temporary Devices Post -Implementation Study Is the Device Effective? 21 INSTALL YES- PERMANENT DEVICE = Minor Arterial Collector - Principal Arterial 22