June 18th, 2012
EQUIPPED FOR EFFICIENCYOptimize Mobility, by Catherine Higgins.
New lanes and interchanges are not the only improvements coming to I-15 in Utah County.
The I-15 CORE Project between Lehi and Spanish Fork wraps up this December. But the wider freeway and 63 rebuilt or improved bridges are not the only features that will help ease traffic flow. Equipment — cameras, signs, fiber-optic cable and ramp meters — will put five systems into operation and help UDOT traffic engineers keep traffic moving efficiently. Here’s an overview:
The project will add a network of cameras, 37 in all, between the Point of the Mountain to Spanish Fork. UDOT uses the cameras to monitor congestion and to identify crashes and other incidents. If needed, the Utah Highway Patrol can dispatch an Incident Management Team to help clear the crash to keep traffic moving and prevent secondary crashes.
Forty-nine Traffic Monitoring Stations will be installed. TMS systems use radar to detect volume and speed. The data collected by TMS units feeds to the UDOT Traffic website. Road users can then view maps with routes marked in green, yellow and red representing real time traffic volume. The TMS data lets UDOT engineers see where backing is occurring on a similar password protected map. Some of the TMS units also have cameras.
Four overhead Variable Message Signs will be installed along the project corridor.The TMS data gathered also feeds to the VMS, giving road users travel times and notification of incidents ahead that are causing delay.
The I-15 CORE project will also add Express Lanes to help UDOT manage traffic flow throughout the freeway corridor. Free for carpools, motorcycles and C-plate vehicles, solo drivers can use the lanes with an Express Pass. UDOT adjusts the price of using the lanes according to traffic conditions — so when traffic is heavy drivers will pay little more. The system allows maximum use of all lanes with the Express Lanes maintaining a speed of 55 mph during peak travel times.
Express Lanes in Salt Lake and Davis County have been popular with road users. Over 10,000 people have purchased an Express Pass. Until the I-15 CORE project is complete in December, the Express Lanes will function as a carpool lane throughout the project. To learn more about Express Lanes, visit the website.
A total of 22 ramp meters will be installed at all interchanges help UDOT regulate traffic getting on and off of the freeway. Ramp meters help traffic flow by minimizing speed differential on the freeway – when all traffic is moving at a similar speed, traffic flow is more efficient and fewer crashes occur.
In all, 26 miles of fiber optic cable buried along the corridor will provide a data-moving artery that supports cameras, TMS, VMS ramp meters and the Express Lanes and lets UDOT communicate in real time. UDOT leaders have charged managers at the Traffic Operations Center with creating a world class Advanced Traffic Management System. Expanding the fiber optic system is an important part of reaching that goal.