01628774

Component

Several research studies have been conducted on the effectiveness of Controller Actuated Beacons (CABs) near isolated high-speed signalized intersections, indicating that CABs are generally effective in reducing accidents. However, while drivers approaching the intersection during flashing CABs might anecdotally accelerate or decelerate depending on their time/distance to the stop bar, the literature lacks guidance on quantifying this behavior and accounting for it in the use of Dilemma Zone (DZ) protection systems in the presence of CABs. This paper focuses on analyzing and identifying key variables that can result in a change in a vehicle trajectory as it approaches intersections with flashing CABs, and develop guidelines for the use of DZ-protection systems in these cases. The findings of this work include identifications of conditions when drivers accelerate and get trapped in DZ due to the CAB operation and provide guidance on placement of CABs and change in DZ-protection boundaries to avoid these situations.

This paper was sponsored by TRB committee AHB25 Standing Committee on Traffic Signal Systems.

01618707

17-04858

English

16p

2017

Transportation Research Board 96th Annual Meeting

Digital/other

Figures; Photos; References

Acceleration (Mechanics); Actuated traffic signal controllers; Behavior; Dilemma zone; Drivers; Flashing beacons; Guidelines; Signalized intersections; Vehicle trajectories

Highways; Operations and Traffic Management

Transportation Research Board Annual Meeting 2017 Paper #17-04858

PRP, TRIS, TRB, ATRI

Dec 8 2016 11:52AM