Knowledge Resources

Adaptive signal control, transit signal priority, and intersection improvements implemented during the Atlanta Smart Corridor project produced a benefit-to-cost ratio ranging from 23.2:1 to 28.2:1.(30 June 2010)

After presence detection, adaptive signal control, and transit signal priority were implemented on the Atlanta Smart Corridor total travel time decreased by 22 percent and total vehicle delay decreased by 40 percent across all peak periods.(30 June 2010)

After presence detection, adaptive signal control, and transit signal priority were implemented on the Atlanta Smart Corridor total fuel consumption decreased by 34 percent across all peak periods.(30 June 2010)

Integrated Corridor Management (ICM) strategies that promote integration among freeways, arterials, and transit systems can help balance traffic flow and enhance corridor performance; simulation models indicate benefit-to-cost ratios for combined strategies range from 7:1 to 25:1.(2009)

In Snohomish County, Washington State, implementation of a transit signal priority system on two test corridors reduced average transit corridor travel time by 4.9 percent, and had insignificant negative impacts on local cross street traffic.(15 June 2007)

Bus rapid transit (BRT) can reduce transit running times by 38 to 69 percent, increase ridership by 35 to 77 percent, and improve service reliability.(2007)

Implementing Transit Signal Priority (TSP) can improve bus running times by 2 to 18 percent.(2007)

When transit signal priority was not used in Portland, Oregon; bus travel times increased up to 4.2 percent during peak periods and up to 1.5 percent in non-peak periods.(19-22 May 2003)

In Los Angeles, transit signal priority reduced total transit travel time by approximately 25 percent.(July 2001)

Implementing traffic signal priority for a light-rail transit line in Toronto, Canada allowed system operators to remove one vehicle from service and maintain the same level of service to passengers.(6-10 August 2000)

A transit priority system along an urban arterial in Vancouver, Canada reduced bus travel time variability by 29 and 59 percent during AM and PM peak periods, respectively.(6-10 August 2000)

At an intersection in Eindhoven, the Netherlands a transit signal priority system reduced bus schedule deviation by 17 seconds. (1-4 May 2000)

When conditional priority was deployed in Eindhoven, the Netherlands; buses experienced 27 seconds of delay without priority and no significant change in delay under conditional priority. (9-13 January 2000)

A bus priority system in Sapporo City, Japan reduced bus travel times by 6 percent, decreased the number of stops by 7 percent, and reduced the stopped time of buses by 21 percent.(1999)

There were 32 accidents along a transitway at the University of Minnesota before transit priority lights were installed, while no accidents were reported after installation of the lights.(2 February 1998)

Transit priority systems in England and France have reduced transit vehicle travel times by 6 to 42 percent, while increasing passenger vehicle travel times by 0.3 to 2.5 percent. (December 1995)

A bus priority system on a major arterial in Portland, Oregon reduced bus travel times by five to eight percent. (July 1994)

Evaluations of the QUARTET PLUS and TABASCO Projects in Europe found that transit signal priority reduced travel time for transit vehicles by 5 to 15 percent.(1994-1998)

In Europe, ITS evaluation reports show that electronic toll collection can decrease traffic volumes by up to 17 percent.(1994-1998)

In Glasglow, Scotland, ITS evaluation reports show that ramp metering can improve freeway capacity by 5 to 13 percent.(1994-1998)

In Europe, a centralized and coordinated paratransit system resulted in a 2 to 3 percent annual decrease in the cost to provide paratransit services.(1994-1998)

In Paris, France, incident management resulted in a nine-minute reduction in response time(1994-1998)

In Europe, ITS studies found customer satisfaction with traveler information delivered via portable electronic devices, public access terminals, Internet web sites, and in-vehicle navigation devices ranged from 50 to 95 percent. (1994-1998)