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A Transit Collision Avoidance Warning System (CAWS) Tested in Virginia Improved the Overall Driving Performance of Bus Operators Through System Alerts; However, Results Were Mixed Regarding Operator Satisfaction and Their Perception of Safety Benefits.

METHODOLOGY The CAWS logged various events, which were transmitted to a central database accessible to managers. When warnings were not displayed to the operator, the CAWS was referred to as…
Content type
Date Posted
07/26/2022

A Green Light Optimal Speed Advisory System for Buses Efficiently Reduced Fuel Consumption by 22.1 Percent and Reduced Vehicle Travel Times by 6.1 Percent Compared to Scenarios Without Any Driving Assistant Systems.

METHODOLOGY B-GLOSA is a bus eco-driving system that computes fuel efficient trajectory of buses using traffic signal data received from downstream signalized intersections. It is formed as an…
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Date Posted
06/09/2022

Simulation Study Estimated Benefit-to-Cost Ratios up to 44.1 for Various Dynamic Bottleneck Mitigation Strategies.

METHODOLOGY Bottleneck solutions in this report are divided into three categories. First, there is a playbook of 70 bottleneck solutions, which are further divided into seven categories classified by…
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Date Posted
12/27/2021

Field Testing of Eco-Driving in Virginia Reveals More Than 20 Percent of Fuel Consumption Savings on Certain Rolling-Terrains.

METHODOLOGY The experiment was conducted on seven rolling roadway segments in Virginia and Maryland, with a total experimental mileage of around 47 miles. The types of terrain varied from mildly…
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Date Posted
12/17/2021

Coordinated actuated traffic signal systems produced a 30 percent reduction in corridor travel times compared to actuated isolated systems, resulting in a benefit/cost ratio of 461.3.

METHODOLOGYThe study obtained data from two treatment sites in Virginia. The first site was in Gloucester County on Route 17, with five non-coordinated actuated signalized intersections, total…
Content type
Date Posted
01/27/2011

To Reduce Excessive Nuisance Alerts Generated by Transit Vehicle Collision Avoidance Warning Systems, Use Location Based Sensitivity Adjustments for Routes That Traverse Both Pedestrian Heavy Areas and Areas with Less Pedestrian Activity.

 Remember that CAWS can be overly sensitive. Based on the survey results, 75 percent of bus operators reported that the CAWS set off many false alarms about pedestrians and bicyclists when…
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Date Posted
07/26/2022

Improve Senior Drivers' Acceptance of Advanced Driver Assistance Systems with Alerts That Mitigate the Difficulty with Turning Their Heads to Check for Blind Spots.

Equip vehicles with BSA and ACC technology for wider acceptance of ADAS among senior drivers. The study results indicated that safety is seniors’ main ADAS-related consideration. Among the…
Content type
Date Posted
01/27/2022

Effectively communicate plans for implementing contraflow lanes during a hurricane evacuation.