Joan Morris 703-259-1799

Jennifer McCord 703-259-1779


Oct. 29, 2010

Smoother traffic flow for heavily congested corridors

CHANTILLY—Starting this weekend, motorists should notice smoother traffic flow on several major roads in eastern Prince William County where 75 signals have been re-optimized to minimize delays, according to the Virginia Department of Transportation (VDOT). The signal network is updated every two years to keep pace with changing traffic patterns and demand.

The 75 signals are located along Prince William Parkway, Minnieville Road, Dale Boulevard and Smoketown Road which provide access to Interstate 95, Potomac Mills and many other retail, residential and office developments. Signals have four timing plans for weekdays – a.m. rush, mid-day, p.m. rush and off-peak – and four timing plans for weekends. Signal times for Saturdays are different than those on Sundays.

“During the optimization process, we collect traffic volume data and make sure green time is optimally allocated to each approach, based on the new traffic demand,” said VDOT Operations Engineering Manager Ling Li.  “It’s a constant balancing act and a challenge but the overarching goal is to have minimum stops or delays along a corridor.”

In addition to the signals, engineers carefully rechecked and updated pedestrian timings at each intersection.

Prior to the re-timings, engineers conducted travel time runs on Minnieville Road and Prince William Parkway and will repeat those runs in November to compare travel times.

In August, 102 signals were re-optimized on Routes 1, 123, Old Bridge Road, Dumfries Road and Prince William Parkway. Before-and-after travel time runs on Route 1 and Old Bridge Road indicate that motorists are saving one to two minutes during peak travel times.

Information in VDOT news releases was accurate at the time the release was published. For the most current information about projects or programs, please visit the project or program Web pages. You may find those by searching by keyword in the search Virginia DOT box above.

Page last modified: Oct. 17, 2012