Signal Coordination and Timing (SCAT)

Various Clients

OBJECTIVE

Improve the efficiency of traffic flow in street systems by strategically optimizing existing traffic signals and street infrastructure. This involves fine-tuning traffic signal timings and enhancing coordination between signalized intersections to alleviate traffic congestion along state routes, arterial streets, and downtown areas. Poorly-synchronized signals lead to increased driver delay, heightened air pollution, and amplified traffic noise, underscoring the urgent need for optimization measures.

PROJECT DESCRIPTION

With proficiency across various signal platforms used in Illinois (including Yunex/Siemens/Eagle and Econolite), HLR specializes in conducting efficient and cost-effective reviews of existing intersection operations. We excel in developing and implementing revised timing plans and controller settings, recognizing that even small adjustments can significantly impact intersection performance and alleviate congestion.

Our SCAT projects typically encompass a thorough process:

• System Review – This involves comprehensive traffic counts, speed and delay studies, examination of existing signal timings, coordination data, and controller settings, along with on-site operational assessments.
• Optimization – We meticulously analyze data to develop improved timing plans tailored for time-of-day or traffic-responsive operations.
• Implementation & Evaluation – Following the analysis phase, we execute the optimized signal settings using platforms such as Yunex Tactics Central and Closed-Loop, Econolite Aries, and Centrax. Subsequently, we conduct field refinements and a final evaluation of performance, employing quantitative measures such as speed, delay, and emissions reductions to gauge effectiveness.

Some notable examples of HLR’s recent SCAT projects include enhancements along:

• Willow Road in Northbrook, Glenview, and Northfield
• Central Business District Signal System Analysis and Design in Elgin
• US Route 45/IL Route 21 and IL Route 22 in Vernon Hills and Lincolnshire
• IL Route 171 in Maywood
• Belvidere Street in Waukegan
• IL Route 62 in Hoffman Estates
• IL Route 53 in Romeoville
• US Route 45 in Des Plaines

Through our expertise and proven track record, HLR is committed to optimizing traffic flow and enhancing intersection efficiency to benefit communities and commuters alike.