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New member
Username: Friscofan

Post Number: 1
Registered: 09-2004
Posted on Thursday, March 10, 2005 - 01:53 pm:   

I know the amount of traffic on Dallas Parkway is heaviest during rush hour - heading south between 6 and 9 a.m. and heading north between 5 and 7 p.m. - but are the lights in those directions coordinated to stay green longer at those times to allow a greater volume of vehicles to pass through?

It's crazy that it takes 45 minutes to travel the 24 miles from downtown Dallas to the end of the Tollway ... and then another 30 minutes to travel the six extra miles to the intersection of 720.

Please advise.

Brad Bierman
New member
Username: Bradb007

Post Number: 3
Registered: 10-2004
Posted on Monday, March 14, 2005 - 10:36 am:   

Are there plans to add a third lane to the existing Dallas parkway prior to the tollway implementation? As the above poster said I work downtown and spend as much time travelling the Frisco portion of the Dallas Parkway then the entire existing tollway.

Brian Moen, Transportation Manager
Username: Brian

Post Number: 240
Registered: 07-2001
Posted on Tuesday, March 15, 2005 - 02:47 pm:   

Brad and Frisco Fan,

The lights are coordinated to stay green longer along Dallas Parkway during most of the day from 5:00am to midnight. In fact, I hear from other motorists wanting to cross Dallas Parkway that it receives too much green time during the AM and PM peak periods. The traffic volumes have outgrown the roadway capacity that is available on Dallas Parkway. It is similar to the signal situation on SH 121 through the Colony area where the signals are coordinated, but the demand far exceeds the capacity of the roadway.

The signals from Stonebrook to Gaylord are coordinated for southbound flow from 5:00am to 1:30pm. From 1:30pm until midnight, they are coordinated to favor northbound traffic flow. The intersection of Main and Dallas Parkway is also coordinated with this system, but only from 3:30pm to 7:30pm.

During the morning peak period, the congestion that was at Main Street has moved to the Stonebrook intersection. We have looked at making timing changes, but the problem will continue to work its way south to the Gaylord and Warren area where there is little that can be done from a signal timing standpoint considering the majority of traffic wants to get on the tollway at the Gaylord entrance ramp.

During the evening peak, there is a significant amount of congestion at the Gaylord intersection. This problem is created by the fact that the rate at which traffic flow from the tollway onto the northbound service road is greater than the signal system along Dallas Parkway can handle. When the DNT extension over SH 121 initially opened last April, the Gaylord location was able to keep up pretty well with the traffic exiting the DNT. However, the Dallas Parkway and Lebanon location was unable to keep up and traffic began to back up on the northbound service road from Lebanon all the way to Warren. As a result, we made adjustments to the signal at Lebanon to increase the green time along the service road but were still unable to accommodate the large volumes. The next step taken was then to reduce the green time at Gaylord to a point where the rest of the signal system from Warren to Main could keep up with the heavy volumes exiting the DNT. This reduction in green time essentially makes the Gaylord location act like a dam where we control the release of cars and stack them onto the tollway where we have a large area for queuing vehicles without impacting other signalized intersections. Obviously this isn't an ideal situation and our preferred solution, but it does allow us to keep our other intersections flowing as smoothly as possible while we progress traffic flow north along the service road during the PM peak.

There are no plans to add the third lane along Dallas Parkway before the tollway implementation. There is room available to add it at a later date, but once the tollway opens the overall frontage road volumes are expected to decrease significantly since most people will be on the tollway.

The completion of Legacy between Lebanon and Main has the best chance to offer relief for Dallas Parkway. This section of Legacy is scheduled to open this June and will provide access all the way to SH 121. Some people also use Parkwood as an alternate route to go down to SH 121 and then use the free ramp on the Plano side to get onto the tollway.

Brian Moen
Transportation Manager

Jeff Pergola
New member
Username: Jeff_pergola

Post Number: 8
Registered: 07-2003
Posted on Wednesday, March 16, 2005 - 08:02 am:   

When will the section of the DNT from SH121 to Main St. begin construction?

You mention that the existing frontage roads in this same location has exceeded the capacity of the roadway due to the demand of traffic flow. That being said I have not seen any construction movement in this section north of SH121 as of yet. Also, what are the estimated start/completion dates for this section of the DNT?

I also noticed that there seems to be some utility work occurring on the right side of the NB lanes between Lebanon and Stonebrook. Can you explain what this work is being done for? Is this part of the prep work for the DNT section? or is this work to bury the existing power/electrical lines that are above the roadway?

Thanks in advance for your response.

New member
Username: Reddog

Post Number: 4
Registered: 07-2003
Posted on Wednesday, March 16, 2005 - 02:42 pm:   

Has the evening timing of NB Dallas Pkwy - Eldorado been altered? Back up to Main.

Brian Moen, Transportation Manager
Username: Brian

Post Number: 241
Registered: 07-2001
Posted on Wednesday, March 16, 2005 - 11:15 pm:   

Jeff and Reddog,

The construction of the section from John Hickman to Eldorado has started. The contractor has been surveying, setting up their field office and clearing areas in preparation for some of the bridge construction. The utility work you are seeing is related to the DNT extension. Several utilites are needed to support the extension and other utilities are being relocated because they are in conflict with the extension.

The contractor for the section from Gaylord to John Hickman was given a notice to proceed last Thursday. You should see more activity in this section as well during the next 30 to 60 days.

The section from Eldorado to US 380 will be put out to bid in May.

NTTA expects the DNT extension from Gaylord to US 380 to be complete by September 2007.

We will check the Eldorado and DNT intersection to make sure the signal is functioning properly. There have been no timing changes made.

Brian Moen
Transportation Manager

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