North Texas Tollway Authority -- Driving Forward - A monthly customer newsletter

September 2009 Issue: Back | Archives

Speed Limits Changing on
NTTA Roads

The NTTA Board of Directors voted in August to adjust speed limits on the Dallas North Tollway (DNT) and President George Bush Turnpike (PGBT) based on the results of a speed study.  The speed limits go into effect as soon as new signs are installed.  Signage installation will begin Aug. 20, and will continue through September 1. The recommended speed limits could not be implemented until environmental speed limit designations were removed on certain portions of the roadway. 

“The speed study results indicate that recommended speed limits are more consistent with the actual flow of traffic,” said Rick Herrington, NTTA deputy executive director.

Adjustments to speed limits on the DNT and PGBT are as follows:

• DNT between Ivan Street and Oak Lawn Avenue – speed limit will decrease from 55 to 50 mph
• DNT between Oak Lawn Avenue and just South of Trinity Mills Road (Dallas/Collin county line) – speed limit will increase from 55 to 65 mph
• DNT between just south of Trinity Mills Road in Dallas and County Road 26 in Frisco – speed limit will increase from 60 or 65 to 70 mph
• DNT between County Road 26 in Frisco and U.S. 380 – speed limits will remain 55 mph
• PGBT between Beltline Road in Irving and west of SH 78 in Garland – speed limit will increase from 60 to 70 mph.
• PGBT between just .2 miles west of SH 78 and SH 78 – speed limit will increase from 50 to 55

The NTTA initiated a speed study to determine appropriate speed limits in conjunction with the implementation of all-electronic toll collection (all-ETC) at the main lane plazas on the DNT and PGBT. The speed study identified the speed at or below which 85 percent of the vehicles travel during free flow conditions on the roadways, also known as the “85th percentile speed.  The NTTA also evaluated characteristics unique to each roadway such as vertical and horizontal curvature, crash records and environmental impacts along the corridors.

Environmental speed limit designations on the DNT and PGBT were removed by the North Central Texas Council of Government with the approval of the Texas Commission of Environmental Quality and Environmental Protection Agency because many of the NTTA’s recent initiatives, such as the transition to all-ETC, offset any increase of emissions due to speed limit adjustments.

For more information, a list of frequently asked questions is available at

Customer Service Center
972-818-6882 (NTTA)

Roadway Customer Service / Courtesy Patrol
972-444-4357 (HELP)

NTTA Command Center

Emergencies on the Roadway
Dial 911 immediately


NTTA Administrative Offices

Current Roadway Conditions and Lane Closures
Driving Conditions

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