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Thirty-Seven (37) Audible Emergency Preemption Systems Installed as Part of the Regional Traffic Signal Program (RTSP) Helped Reduce Emergency Response Time by 14 to 23 Percent.

METHODOLOGY A benefit-to-cost analysis was performed for the first year after installation of the third cycle of projects. There were 148 signals upgraded across the 15 different corridors with AADT…
Content type
Date Posted
11/29/2023

The Nine-Month Capital and Maintenance Cost for Driveway Assistance Devices in One-Lane, Two-Way Work Zones in Ohio Was Estimated as $20,700.

Cost Subsystem
Part-width construction methods are commonly used on suburban and rural two-lane roadways, which require one-way travel along a two-way corridor. This method, however, presents challenges at…
Content type
Made Public Date
08/30/2023

Use of Driveway Assistance Devices in Signalized Work Zones in Ohio Reduced Driveway Waiting Time by 46 Percent and Reduced Vehicle Speeds by 28 Percent Compared to Temporary Traffic Signals.

METHODOLOGY Video data were collected to collect volume, queuing, compliance, safety, and speed of vehicles within the work zone, both along the mainline and at the driveways. For two of the work…
Content type
Date Posted
08/30/2023

Adaptive Signal Control Implemented in Nebraska Provided Adjustments During Atypical Conditions but Found to Not Outperform Static Timing Patterns During Recurring Traffic Demand.

METHODOLOGY In this study, two methods of data collection were considered. First, GPS travel time runs were conducted twice to eliminate the impact of normal seasonal variations in traffic flow for…
Content type
Date Posted
07/25/2023
Taxonomy (ARC-IT) Traffic Signal Control (TM03)

Empirical Study in Florida Found That Signal Retiming Effectively Reduced Average Travel Time on Arterial Roads by Over 40 Percent for Traffic Entering Sporting Events, but Not so Much After the Events.

METHODOLOGY In this study, traffic volumes were collected from loop detectors installed by the Lee County Department of Transportation (Lee DOT) while travel time was determined from Bluetooth…
Content type
Date Posted
06/30/2023

Leveraging Variable Message Signs (VMS) and Adaptive Signal Control to Inform and Regulate Travelers Reduced 10 to 20 Percent Peak Time Traffic for Central London During Olympics Game Event.

METHODOLOGY A dedicated 109-mile Game Lane route (Olympic Route Network [ORN]) was established for the Olympic Games, connecting Heathrow Airport to the main event sites in central and east London.…
Content type
Date Posted
06/30/2023

Los Angeles's Automated Traffic Surveillance and Control System Reduced Travel Time by Ten Percent Using 40,000 Loop Detectors Across 4,500 Connected Intersections with Automated Signal Control.

METHODOLOGY In this study, the Smart City Infrastructure involved the essential, physical technology required to provide connectivity, sensors, and communications across urban LA, through wireless…
Content type
Date Posted
07/25/2023
Taxonomy (ARC-IT) Traffic Signal Control (TM03)

Estimated Cost for Implementing Max-Pressure Adaptive Signal Control on 3,280 Intersections in the Twin Cities Metro Area in Minnesota was $69,961,900.

To implement the max-pressure signal timing technology, additional loop detectors would be needed to determine queue lengths at the signalized intersections. In addition to loop detectors, another…
Content type
Made Public Date
07/25/2023
Taxonomy (ARC-IT) Traffic Signal Control (TM03)

Traffic Optimization for Signalized Corridor (TOSCo) Applications Can Reduce Vehicle Stop Delays by Approximately 50 Percent in Large Metropolitan Areas Where V2I and V2V Technology Market Penetration Increases.

METHODOLOGY The study used an off-the-shelf traffic simulation software, and calibrated the model based on travel time data available through the National Performance Management Research Data Set (…
Content type
Date Posted
04/28/2023
Taxonomy (ARC-IT) Traffic Signal Control (TM03)