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European Study on Cooperative Intelligent Transport Systems (C-ITS) Estimated a Safety Benefit of 3,932 to 8,774 Avoided Deaths Across the European Union by 2040.

METHODOLOGY The three different communication solutions considered in this study to assess the potential benefits from the two use cases were specifically: (1) LTE-PC5: Communication solution that…
Content type
Date Posted
10/30/2023

An Active Safety-Collision Warning Pilot in Washington State Estimated a Potential Upper Bound of Annual Total Net Benefits Between $1.1M and $2.1M Due to Prevention of Collisions with Vehicles, Pedestrians, and Bicyclists.

METHODOLOGY The first phase of this project involved equipping 38 transit buses with the CAWS. The buses traveled 352,129 miles during 23,798 operating hours from April 1, 2016 to June 30, 2016.…
Content type
Date Posted
10/30/2023

Incorporate Typical Driver Reactions and Countermeasures into Algorithms Developed for Collision Avoidance Warning Systems and Automated Emergency Braking to Reduce Unnecessary In-vehicle Warnings.

The lessons learned from this project include Return on Investment (ROI) for CAWS/AEB, testing procedures, the importance of bus original equipment manufacturer (OEM) involvement, transit research…
Content type
Date Posted
09/29/2023

Simulation Results Revealed a V2I-based Speed Advisory System Increased the Minimum Time to Collision by an Average of 1.2 Seconds.

METHODOLOGY This study examined the effects of varying levels of SAS MPR (0%, 25%, 50%, 75%, 100%) on rear-end collision risks. Real vehicle trajectories, vehicle lengths, and signal timing were…
Content type
Date Posted
03/24/2023

Manage Deployment Risks Related to Connected Vehicle Technology Maturity by Reducing Exposure to External Uncertainties and Adding Testing at an Earlier Stage.

Broaden the definition and concept of technical maturity to increase stakeholder knowledge and allow for better risk management. The lack of technology maturity resulted in challenges such as…
Content type
Date Posted
12/28/2022

Connected Vehicle Speed Limit Warnings Increased Speed Compliance by 16 Percent During a Pilot Test in New York City.

METHODOLOGY The deployed vehicles experienced 107,609 alerts by V2I applications and 52,680 by V2V applications. Of all these events, 65,231 alerts were silent and 95,058 alerts were active. After…
Content type
Date Posted
11/28/2022

Simulator Study Finds That Drivers Reduced Visual Scanning Behavior at Intersections when Using Assistive Systems.

Methodology Using 24 licensed driver participants driving in a simulated city environment, CAVIMAS was used to analyze behavior in three common intersection-related crash types, left turn across path…
Content type
Date Posted
07/27/2022

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…
Content type
Date Posted
07/26/2022

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