I-95 Express Lanes ITSNorthern Virginia
Price-managed lanes require complex ITS network
HNTB designed toll signs, dynamic messaging boards and communication and power systems for a 29-mile segment of Northern Virginia’s I-95 Express Lanes project, which includes HOT-lane tolling.
The price-managed lanes required complex ITS design because traffic flows one way during morning rush hour and is reversed to accommodate end-of-workday commuters, using a series of gates to open and close lanes depending on the direction of traffic.
HNTB designed the gates and their relevant dynamic message signs, as well as two types of closed-circuit televisions that use automated cameras to ensure that all vehicles have exited before the lanes are reversed. The cameras also assist the concessionaire by sensing when there is a stopped vehicle, an accident or debris in the roadway.
Project included installation of:
• 700 miles of cable
• 1,000 tolling and traffic management devices
• 130 new sign structures
• 5 tolling sites
• 30 toll gantries