T YL E R ST RE E T AND POL K ST RE E T (CANT Y ST RE E T T O PE MBROKE AVE NUE ) PROPOSE D T WO- WAY CONVE RSION PROJE CT Pre pa re d b y City o f Da lla s Pub lic Wo rks De pa rtme nt City o f Da lla s Pla nning & Urb a n De sig n De pa rtme nt City o f Da lla s De pa rtme nt o f Stre e t Se rvic e s Ha yde n Co nsulta nts, Inc . June 16, 2016 1
Pr e se ntation Ove r vie w Project Scope Project Goals Project Overview Roundabout at northern Tyler/Polk junction Southern Tyler/Polk junction reconfiguration Two-way Conversion Traffic Study Summary Thoroughfare Plan Amendment Process 2
Pr oje c t Sc ope Convert the existing Tyler/Polk couplet into dual two-way traffic streets Replace existing traffic signals with new state-of-the-art traffic signals to improve efficiency and traffic flow Striping/signage improvements Provide roundabout on the north end of the existing couplet Provide new traffic signal on the south end of the existing couplet Provide Rapid Rectangular Flashing Beacons (RRFB) or new traffic signal at the intersection of W. 9 th Street and Tyler Estimated cost: $3.25 million 3
Pr oje c t Goals Promote economic development: Improved access and circulation Improved quality of life: Traffic calming Provide healthier/more walkable neighborhood Create gateways into the neighborhood: Provide landscaped roundabout at north end of existing couplet Provide landscaping at south end of existing couplet Improved emergency response times 4
Pr oje c t Ove r vie w Project location Existing traffic conditions Proposed two-way conversion traffic conditions Tyler/Polk northern junction – roundabout Tyler/Polk southern junction – new traffic signal Tyler-Polk proposed roadway cross-sections & markings/striping layouts Plan A - Polk with Bike Lanes (Staff Recommendation) Plan B – Polk without Bike Lanes 5
Pr oje c t L oc ation Polk Street Tyler Street 12 th Street Jefferson Blvd Davis Street 10th Street 6
E xisting T r affic Conditions Polk Street Tyler Street 12 th Street Jefferson Blvd Davis Street 10th Street Tyler Street One-way Northbound Polk Street One-way Southbound 7
Pr opose d T wo- Way Conve r sion Modify/Replace existing New Traffic Signal at traffic signals Southern Tyler/Polk Junction Polk Street Tyler Street Jefferson Blvd 12 th Street Davis Street 10th Street 9th Street Rapid Rectangular Flashing Beacon New Roundabout at (RRFB) or Northern Tyler/Polk New Traffic Signal Junction Tyler Street Two-way traffic Polk Street Two-way traffic 8
T yle r / Polk Nor the r n Junc tion - Roundabout 9
BENEFITS Roundabouts are becoming more common in the United States and the state of Texas due to their many benefits. Safer Efficient How to get around Roundabouts are safer than other intersections Roundabouts reduce delay by allowing motorists to yield because severe head-on and left-turn crashes do Observe all standard road rules, including rather than stop at a red light. They can also handle higher not occur. Other safety benefits include slower yielding for pedestrians in crosswalks traffic volumes, which helps vehicles get through quicker. speeds and the one-way circulating traffic. To safely and efficiently drive a roundabout: Economical Accident reduction at • Slow down Roundabouts are proven to roundabouts reduce overall accident rates in Reducing driver delay saves time and fuel. Eliminating signals also • Read advance signing and choose Wisconsin by approximately saves approximately $3,000 to $5,000 per year in maintenance correct lane 9%, and reduce severe crashes and energy costs. • Yield to traffic in all lanes on your left by 52%. The 2011 Study by the before entering Green UW Traffic Operations & Safety 52% • Stay in your lane to your exit Laboratory reported zero fatal 9 % crashes. Roundabouts reduce fuel consumption and vehicle pollution because vehicles are not idling at a red light. ALL INJURY In addition, studies show fewer The center island of a roundabout provides an opportunity to accidents involving pedestrians beautify the location with landscaping. Flowers, trees, or even and bicyclists at roundabouts as compared to signalized simple green space can be placed in the center of a intersections. roundabout, making the intersection aesthetically pleasing. Roundabout Myths vs. Facts Yield ► Myth: Traffic circles/ rotaries and Myth: Roundabouts are not The “Golden Rule” pedestrian and bicyclist friendly. roundabouts are the same thing. of driving roundabouts. Fact: There are statistically fewer Fact: Traffic circles have high-speed pedestrian and bicycle crashes at entries, variable yield rules, low When you enter the roundabout, you roundabouts than at signalized capacity, and many high-speed must yield to circulating traffic . intersections. Drivers are required to crashes. They are dangerous and yield to pedestrians in the confusing to drive. Yield means the other drivers in the crosswalks, while refuge islands circle have the right of way. A Roundabouts require motorists to yield provide a space for pedestrians in motorist approaching a roundabout on entry, speeds are low, capacity is the middle of each crossing so should wait for a safe gap in traffic high, and crashes are few and minor. pedestrians only cross one direction before entering. They are designed to be easy to use 10 of traffic at a time. and provide a higher level of driver safety.
T yle r / Polk Southe r n Junc tion - Signal 11
T yle r and Polk Pr opose d Cr oss- Se c tions Plan A – Polk with Bike L ane s (Staff Re c omme ndation) On-Street Parallel On-Street Parallel Parking Parking 12
Pr opose d T wo- Way Conve r sion Mar kings/ Str iping L ayout Plan A – Polk with Bike L ane s (Staff Re c omme ndation) 13
Propose d T wo- Wa y Conve rsion Ma rking s/ Striping L a yout Continue d Plan A – Polk with Bike L ane s (Staff Re c omme ndation) 14
T yle r and Polk Pr opose d Cr oss- Se c tions Plan B – Polk without Bike L ane s On-Street Parallel On-Street Parallel On-Street Parallel On-Street Parallel Parking Parking Parking Parking POLK STREET 15
Pr opose d T wo- Way Conve r sion Mar kings/ Str iping L ayout Plan B – Polk without Bike L ane s 16
Propose d T wo- Wa y Conve rsion Ma rking s/ Striping L a yout Continue d Plan B – Polk without Bike L ane s Still working ongraphic which wil be added soon. 17
Two-way Conversion Traffic Study Existing Conditions Tyler – 3 lanes northbound Polk – 3 lanes southbound Plan A – Polk with Bike Lanes (Staff Recommendation) Tyler – 2 lane undivided roadway (one lane each direction) w/ parallel parking Polk – 2 lane undivided roadway (one lane each direction) w/ bike lanes and parallel parking on the west side Plan B – Polk without Bike Lanes Tyler – 2 lane undivided roadway (one lane each direction) w/ parallel parking Polk – 4 lane undivided roadway (two lanes each direction) w/ parking prohibited for the peak hour peak direction 18
Motor Vehicle Level of Service at Signalized Intersections Level of Service (LOS) is a qualitative measure describing operational conditions within a traffic stream, based on service measures such as speed and travel time, freedom to maneuver, traffic interruptions, comfort, and convenience. (LOS) Average Delay per Vehicle General Description (seconds per vehicle) A Less than or equal to 10 seconds Free Flow B 10-20 seconds Stable flow (slight delays) C 20-35 seconds Stable flow (acceptable delays) D 35-55 seconds Approaching unstable flow (tolerable delay, occasionally wait through more than one signal cycle before proceeding) E 55-80 seconds Unstable flow (intolerable delay) F Greater than 80 seconds Forced flow (jammed) 19
Two-Way Conversion Traffic Study Summary – (AM Peak Traffic Period) Intersection Existing Traffic Conditions Plan A – Polk w/ Bike Lanes Plan B – Polk w/o Bike Lanes (Staff Recommendation) Level of Service Average Delay per Level of Service Average Delay per Level of Service Average Delay per Vehicle (Seconds) Vehicle (Seconds) Vehicle (Seconds) Tyler at Davis C 29.4 C 25.2 B 19.8 Tyler at Tenth A 5.1 A 6.9 A 8.5 Tyler at Jefferson B 11.3 C 23.8 B 15.3 Tyler at Twelfth B 14.3 B 17.1 B 11.8 Tyler at Polk N/A N/A A 9.3 A 7.8 (southern junction) Polk at Kings Hwy B 12.3 A 8.1 A 7.3 Polk at Davis B 13.0 C 21.6 B 16.4 Polk at Tenth B 11.1 A 5.1 A 3.9 Polk at Jefferson B 14.1 C 26.1 B 19.5 Polk at Twelfth B 10.1 B 18.0 B 19.9 20
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