October 21st, 2013

Traffic Signal Performance Measures announced as a 2013 AASHTO Innovation Initiative

Optimize Mobility, by Lisa Miller.
Engineer Mark Taylor working in an open traffic signal cabinet

Engineer Mark Taylor working in a traffic signal cabinet.

Managing traffic is an effective way to reduce congestion, save fuel costs and improve safety. One of the most visible components of the traffic management landscape is traffic signals. Day-to-day traffic challenges keep the staff at the UDOT Traffic Operations Center (TOC) very busy- especially during winter weather, special events and during the morning and evening commutes. The operators at the TOC have the ability to remotely operate nearly 80% of Utah’s traffic signals, which can be a very helpful way to alleviate traffic congestion. Each signalized intersection has a metal cabinet adjacent to the intersection that holds the equipment needed to operate the traffic signals. The equipment that operates the traffic signal can be programmed for specific traffic patterns along a corridor in an effort to better manage traffic.

Every year, the American Association of State and Highway Transportation Officials (AASHTO) identifies innovative projects that have been successfully adopted by transportation agencies across the country. One of the 2013 AASHTO Innovation Initiatives was UDOT’s Traffic Signal Automated Performance Measures program. The program developed a structure that will allow UDOT to actively manage, in real-time, its traffic signal systems which will help traffic flow as efficiently as possible along any given roadway corridor. “When we have a maximum number of vehicles arriving at a traffic signal when the light is green, traveler delay is minimized,” said Mark Taylor, UDOT’s Traffic Signal Engineer. Other benefits to well-timed traffic signals are reduction in vehicle emissions and reduction in crashes. Since traffic management needs to occur every day of the week and at all times of day, the Performance Measures program helps to monitor and improve traffic flow even when a traffic signal engineer is not available.

UDOT is moving forward with an AASHTO Technology Implementation Group (TIG) which will work to document the techniques, benefits and technologies UDOT is using for Traffic Signal Performance Measures so other interested transportation agencies can begin their own program in this important area. More information about the AASHTO Innovation Initiatives selected for 2013 can be found on their website.

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