1. Tyler Street and Polk Street (Canty Street to Pembroke Avenue) proposed two-way conversion project
Prepared by
City of Dallas Public Works Department City of Dallas Planning & Urban Design Department City of Dallas Department of Street Services
Hayden Consultants, Inc.
July 12, 2016

2. Presentation Overview
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

3. Project Scope
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. 9th Street and Tyler
Estimated cost: $3.25 million

4. Project Goals Promote economic development: Improved quality of life:
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

5. Project Overview 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

6. Project Location King’s Hwy Polk Street Tyler Street 12th Street
Jefferson Blvd
10th Street
Davis Street

7. Existing Traffic Conditions
King’s Hwy
Polk Street
Tyler Street
12th Street
Jefferson Blvd
10th Street
Davis Street
Tyler Street One-way Northbound Polk Street One-way Southbound

8. Proposed Two-Way Conversion
Modify/Replace existing traffic signals
New Traffic Signal at Southern Tyler/Polk Junction
King’s Hwy
Polk Street
Tyler Street
Rapid Rectangular Flashing Beacon (RRFB) or New Traffic Signal
12th Street
Jefferson Blvd
10th Street
9th Street
Davis Street
New Roundabout at Northern Tyler/Polk Junction
Tyler Street Two-way traffic Polk Street Two-way traffic

9. Tyler/Polk Northern Junction - Roundabout

10. BENEFITS Roundabout Myths vs. Facts The “Golden Rule”
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 because severe head-on and left-turn crashes do not occur. Other safety benefits include slower speeds and the one-way circulating traffic.
Roundabouts reduce delay by allowing motorists to yield rather than stop at a red light. They can also handle higher traffic volumes, which helps vehicles get through quicker.
Observe all standard road rules, including
yielding for pedestrians in crosswalks
To safely and efficiently drive a roundabout:
Economical
Slow down
Read advance signing and choose correct lane
Yield to traffic in all lanes on your left before entering
Stay in your lane to your exit
Accident reduction at roundabouts
Roundabouts are proven to reduce overall accident rates in Wisconsin by approximately 9%, and reduce severe crashes by 52%. The 2011 Study by the UW Traffic Operations & Safety Laboratory reported zero fatal crashes.
Reducing driver delay saves time and fuel. Eliminating signals also saves approximately $3,000 to $5,000 per year in maintenance and energy costs.
Green
52% 9%
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 beautify the location with landscaping. Flowers, trees, or even simple green space can be placed in the center of a roundabout, making the intersection aesthetically pleasing.
accidents involving pedestrians
and bicyclists at roundabouts as compared to signalized intersections.
Roundabout Myths vs. Facts
Yield ►
Myth: Traffic circles/rotaries and
Myth: Roundabouts are not
The “Golden Rule”
roundabouts are the same thing.
pedestrian and bicyclist friendly.
of driving roundabouts.
Fact: Traffic circles have high-speed entries, variable yield rules, low capacity, and many high-speed crashes. They are dangerous and confusing to drive.
Fact: There are statistically fewer pedestrian and bicycle crashes at roundabouts than at signalized intersections. Drivers are required to yield to pedestrians in the crosswalks, while refuge islands provide a space for pedestrians in the middle of each crossing so pedestrians only cross one direction of traffic at a time.
When you enter the roundabout, you
must yield to circulating traffic.
Yield means the other drivers in the circle have the right of way. A motorist approaching a roundabout should wait for a safe gap in traffic before entering.
Roundabouts require motorists to yield on entry, speeds are low, capacity is high, and crashes are few and minor. They are designed to be easy to use and provide a higher level of driver safety. 10

11. Tyler/Polk Southern Junction - Signal

12. Tyler and Polk Proposed Cross-Sections Plan A – Polk with Bike Lanes (Staff Recommendation)
On-Street Parallel
Parking
On-Street Parallel
Parking

13. Proposed Two-Way Conversion Markings/Striping Layout Plan A – Polk with Bike Lanes (Staff Recommendation)

14. Proposed Two-Way Conversion Markings/Striping Layout Continued Plan A – Polk with Bike Lanes (Staff Recommendation)

15. Tyler and Polk Proposed Cross-Sections Plan B – Polk without Bike Lanes
On-Street Parallel
Parking
On-Street Parallel
Parking
On-Street Parallel
Parking
On-Street Parallel
Parking
POLK STREET

16. Proposed Two-Way Conversion Markings/Striping Layout Plan B – Polk without Bike Lanes

17. Proposed Two-Way Conversion Markings/Striping Layout Continued Plan B – Polk without Bike Lanes
Still working ongraphic which wil be added soon.

18. 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
Polk – 4 lane undivided roadway (two lanes each direction) w/ parking prohibited for the peak hour peak direction

19. 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
(seconds per vehicle)
General Description 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)

20. Two-Way Conversion Traffic Study Summary – (AM Peak Traffic Period)
Intersection
Existing Traffic Conditions
Plan A – Polk w/ Bike Lanes
(Staff Recommendation)
Plan B – Polk w/o Bike Lanes
Level of Service
Average Delay per Vehicle (Seconds)
Tyler at Davis C
29.4
25.2 B
19.8
Tyler at Tenth A
5.1
6.9
8.5
Tyler at Jefferson
11.3
23.8
15.3
Tyler at Twelfth
14.3
17.1
11.8
Tyler at Polk (southern junction)
N/A
9.3
7.8
Polk at Kings Hwy
12.3
8.1
7.3
Polk at Davis
13.0
21.6
16.4
Polk at Tenth
11.1
3.9
Polk at Jefferson
14.1
26.1
19.5
Polk at Twelfth
10.1
18.0
19.9

21. Two-Way Conversion Traffic Study Summary – (PM Peak Traffic Period)
Intersection
Existing Traffic Conditions
Plan A – Polk w/ Bike Lanes
(Staff Recommendation)
Plan B – Polk w/o Bike Lanes
Level of Service
Average Delay per Vehicle (Seconds)
Tyler at Davis B
13.4 C
20.5
18.8
Tyler at Tenth A
7.1
5.9
6.4
Tyler at Jefferson
14.9
34.9
14.5
Tyler at Twelfth
12.7
33.6
16.3
Tyler at Polk (southern junction)
N/A
15.1
Polk at Kings Hwy
5.3
8.4
6.7
Polk at Davis
20.6
13.1
Polk at Tenth
5.2
9.0
7.6
Polk at Jefferson
13.6
17.3
15.0
Polk at Twelfth
14.2
18.3
17.4

22. Tyler-Polk Two-Way Traffic Study
Conclusions
Two-way conversion of Tyler/Polk is feasible from a traffic operation standpoint
Plan A (dedicated bike lanes on Polk) – traffic delays will increase slightly throughout the corridor but still remain within an acceptable/comfortable level of service
Plan B (no dedicated bike lanes on Polk) - traffic flow/operational impacts throughout the corridor will be negligible
Plans A and B will accommodate DART bus operations; designated bus stop locations will allow buses to pull to the side of the road, thus leaving one lane of traffic open to vehicles so as to not impede traffic flow

23. Thoroughfare Plan (TP) Amendment Process
~ Three month process
Interdepartmental staff review to gather information from various City departments and other agencies
Community meeting with the property owners to discuss amendment and address concerns when necessary
Item considered and voted on by three bodies: 1) City Plan Commission Transportation Committee (CPCTC); 2) City Plan Commission (CPC); and 3) City Council has final authority to approve or deny

24. TP Amendment Process (Continued)
City Plan Commission will hold a public hearing to solicit citizen input before the CPC forwards a recommendation to City Council
City Council will hold a public hearing and take into consideration the recommendations of the CPC and make the final determination whether the thoroughfare plan is amended
If City Council approves the amendment to the Thoroughfare Plan, the map and text will be changed to reflect the amendment

25. TP Amendment Proposed Timeline
1st Public Meeting – April 7, 2015, TECO/Bishop Arts Theatre Center
2nd Public Meeting – April 21, 2016, Tyler Street United Methodist Church
3rd Public Meeting – June 16, 2016, Kidd Springs Recreation Center
4th Public Meeting – June 21, 2016, Cliff Temple Baptist Church
5th Public Meeting – July 12, 2016, Elmwood-El Buen Samaritano United Methodist Church
CPC Transportation Committee – May 5, 2016; July 21, 2016, City Council Chambers
City Plan Commission – August 18, 2016, 1:30 p.m. City Council Chambers, Public Hearing
City Council – *September 14, 2016, 1:00 p.m. City Council Chamber, Public Hearing
Contact for any questions or comments: Kimberly Smith, ,
*Tentative Date

26. Tyler/Polk Project Schedule
Thoroughfare Amendment Plan Process: June 2016 – September 2016
Tyler/Polk Engineering Design: Fall Spring 2017
Tyler/Polk Construction: Summer Summer 2018

27. Questions or Comments?
Staff and consulting teams will be available at the various subject matter stations to address questions
Staff Contacts:
Tanya Brooks, Assistant Director
Planning and Urban Design
City of Dallas
Tim Starr, P.E., Assistant Director
Public Works Department
City of Dallas

28. Appendix – Traffic Study

29. Tyler-Polk Two-Way Traffic Study Traffic Volumes Existing AM Peak

30. Tyler-Polk Two-Way Traffic Study Traffic Volumes Existing PM Peak

31. Tyler-Polk Two-Way Traffic Study
Plan A traffic modeling assumed a 60/40 traffic split between Tyler/Polk respectively
Plan B traffic modeling assumed a 40/60 traffic split between Tyler/Polk respectively
Detailed traffic modeling results available upon request

32. Two-Way Conversion Traffic Study Summary – (AM Peak Traffic Period)
Intersection
Existing Traffic Conditions
Plan A – Polk w/ Bike Lanes
(Staff Recommendation)
Plan B – Polk w/o Bike Lanes
Level of Service
Average Delay per Vehicle (Seconds)
Tyler at Davis C
29.4
25.2 B
19.8
Tyler at Tenth A
5.1
6.9
8.5
Tyler at Jefferson
11.3
23.8
15.3
Tyler at Twelfth
14.3
17.1
11.8
Tyler at Polk (southern junction)
N/A
9.3
7.8
Polk at Kings Hwy
12.3
8.1
7.3
Polk at Davis
13.0
21.6
16.4
Polk at Tenth
11.1
3.9
Polk at Jefferson
14.1
26.1
19.5
Polk at Twelfth
10.1
18.0
19.9

33. Two-Way Conversion Traffic Study Summary – (PM Peak Traffic Period)
Intersection
Existing Traffic Conditions
Plan A – Polk w/ Bike Lanes
(Staff Recommendation)
Plan B – Polk w/o Bike Lanes
Level of Service
Average Delay per Vehicle (Seconds)
Tyler at Davis B
13.4 C
20.5
18.8
Tyler at Tenth A
7.1
5.9
6.4
Tyler at Jefferson
14.9
34.9
14.5
Tyler at Twelfth
12.7
33.6
16.3
Tyler at Polk (southern junction)
N/A
15.1
Polk at Kings Hwy
5.3
8.4
6.7
Polk at Davis
20.6
13.1
Polk at Tenth
5.2
9.0
7.6
Polk at Jefferson
13.6
17.3
15.0
Polk at Twelfth
14.2
18.3
17.4