Ramp Metering, NC, United States

Q-Free deployed the first four ramp meters in North Carolina to improve traffic flow along the heavily-traveled northern arc of the I-540 in the Raleigh area.

Ramp meters are traffic signals installed on freeway on-ramps to control the frequency at which vehicles enter the flow of traffic on the freeway.

They are proven to reduce mainline congestion and overall delay, while increasing mobility through the freeway network and traffic throughput by breaking up platoons of vehicles entering the freeway and competing for the same limited gaps in traffic. This also helps reduce collisions and congestion, having a positive impact on safety and the environment.

Q-Free deployed the first four ramp meters in North Carolina to improve traffic flow along the heavily-traveled northern arc of the I-540 in the Raleigh area. The forecasted total net benefits of the Q-Free Intelight ramp meter solution is expected to exceed 7.5 million USD over the next decade.

Decreased Delay Benefits

  • $9.6 million in driver delay savings over 10 years
  • 13 hours of delay savings over 10 years for the average daily commuter vehicle
  • 8.5% annual decrease in vehicle hours of delay • $38 a year in delay savings for the average daily commuter vehicle

Travel Time Reductions

  • 84% of commuters experienced shorter drive times
  • Up to 2 minutes (7.3%) decrease in drive time per day for a commuter Congestion and Volume Improvements
  • 9% decrease in reoccurring congestion
  • 12 minute decrease in congested period per day
  • Overall increase in driver volumes