A New Project in Dallas Aims
August 27, 2013 Leave a comment
It’s a dilemma just about every driver has encountered: You’re stuck on the freeway, and traffic is moving at a snail’s pace. Is there an accident, you ask yourself, or is it just typical congestion? Should you exit and take the feeder road, or stick with the interstate? A new, local program could help give motorists more clarity in just these types of situations.
This October, transportation officials in the Dallas area will debut a new program known as Integrated Corridor Management (ICM) along U.S. 75, which extends 28 miles from the city to its northern suburbs. Under the program, all transportation assets in an area are treated as part of a single system. In other words, trains, highways, surface streets and so on will be taken into account when deciding how best to keep traffic flowing, especially when something goes wrong. “What you’re going to experience is a more reliable trip, less congestion and less queuing,” says Koorosh Olyai, who led the ICM project while assistant vice president for mobility programs development at Dallas Area Rapid Transit (DART). Olyai now works in the private sector for the firm Stantec, but continues to assist DART on the project.
Dallas was selected by the U.S. Department of Transportation as a pilot site for ICM because it’s highly congested — the fifth most congested city in the U.S. — and it’s getting worse. U.S. 75 also represents the perfect place to test the concept, given the range of transportation assets along the corridor: a freeway with ultrasonic sensor, managed HOV lanes, a tollway, 167 miles of arterials, bus routes, a light rail line and 900 traffic signals. The highway itself carries about 250,000 vehicles every weekday.
Because traffic engineers would have planned for many different scenarios ahead of time, they’ll know exactly how to tweak the timing of the traffic lights on the frontage road or even arterial roads to accommodate the overflow. In the past, when there’s been a morning rush hour collision, officials might not have changed signal timing, or if they did, the changes might not have extended beyond a given city’s boundaries. Now, “as soon as we got notification the incident happened, we’d go in with just a couple clicks and re-time the signals,” Saylor says.
The focus of the program is more on coordination than technology, since things like loop detectors and speed monitors are largely already in place. A pre-programmed pattern, for instance, would ensure Richardson’s lights are coordinated with those of neighboring cities like Dallas and Plano, and the pattern would be designed to maximize efficiency of exiting freeway traffic while balancing the needs of other drivers.
If there’s an extremely disruptive situation, freeway drivers could be directed to exit and take the light-rail to work. Because the number of available parking spaces at park-and-ride facilities are monitored, as is existing light-rail ridership, drivers would only be directed to the facilities where there’s room to accommodate them.
The project is funded with $5.3 million from the U.S. Department of Transportation, a local share of $3 million and nearly $1 million in other federal funds. Officials say the benefits from things like travel-time savings and reductions in fuel consumption and emissions, amount to about $264 million in savings over 10 years. San Diego is also in the midst of a similar ICM study.
After a year, the pilot will be analyzed. If the results are promising, ICM could prove to be an inexpensive but effective tool for managing traffic conditions at a time when transportation agencies are short on funding. “There’s a lot of interest in implementing this,” Olyai says. “It’s logical. It’s low-cost. It’s using existing assets more efficiently.”
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