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Following the Implementation of an Overheight Vehicle Detection System, No Bridge Strikes Were Reported at the Historically Problematic Low-Clearance Overpass in Maine.

METHODOLOGY The DMS in Maine displays a variety of information, including weather and roadway conditions, special events, travel times, enforcement actions, and congestion management. For the VSLS…
Content type
Date Posted
07/27/2023

Combined Variable Speed Limit and Ramp Metering System along the Atlanta Beltway Estimated to Reduce Total Travel Time by About Eight Percent.

METHODOLOGY This study proposed a combined VSL-RM algorithm designed to maximize freeway capacity by mitigating the capacity drop phenomenon at merge bottlenecks. The optimal speed of the VSL-RM…
Content type
Date Posted
03/22/2023

Before-and-After Study of Freeway Variable Speed Limit Installations Estimated Crash Reductions of 34 Percent in Wyoming and 29 Percent in Georgia.

Methodology The potential to reduce crashes was assessed by estimating crash modification factors (CMFs) associated with the safety improvement strategy in terms of total, fatal, and injury, and…
Content type
Date Posted
06/16/2022
Taxonomy (ARC-IT) Variable Speed Limits (TM20)

Simulation Study of a Multi-Segment Variable Speed Limit Control Strategy Finds an Overall 14 Percent Reduction in Fuel Consumption and an Increase in Travel Time of 9 Percent.

Methodology The three VSL control scenarios were tested through microsimulation of a ten-mile freeway section of eastbound Interstate 80 near Davis, California, containing four junctions with…
Content type
Date Posted
05/25/2022
Taxonomy (ARC-IT) Variable Speed Limits (TM20)

Simulation Study Finds That an Optimized Variable Speed Limit and Ramp Metering Strategy Could Reduce Overall Travel Time at Two Merge Bottlenecks by 3 to 4 Percent.

Methodology The GTsim microsimulation package was used in the analysis along with one month of traffic data (volume, speed, and occupancy at 20-second intervals) from February 2019 from Georgia…
Content type
Date Posted
03/23/2022

Changing Variable Speed Limit Signs from White to Amber Legend Decreased Crashes by Approximately 50 Percent and Increased Driver Compliance by Nine Percent in Utah.

METHODOLOGY Researchers collected data on a biweekly basis during October 2018, October 2019, January 2019, and January 2020. Vehicle travel speeds and traffic flow data were collected from…
Content type
Date Posted
02/24/2022

Simulation Study Estimates a Combination of Connected Vehicle Control and Variable Speed Limit Strategies Can Reduce Rear-End Crash Risk under Fog Conditions by 48.7 Percent.

Methodology In the driving simulation, throttle release time, brake transition time, perception response time, brake reaction time, minimum modified time-to-collision, and maximum brake pedal…
Content type
Date Posted
02/21/2022

The Distance Between Consecutive Variable Speed Advisory (VSA) Signs Installed on State Highways Should Not Be Greater Than One-Half Mile According to a Caltrans Field Study.

The following were lessons learned from field testing. Implement VSA sign with radar detection to better estimate the mainline traffic and to evaluate driver compliance using traffic speed and…
Content type
Date Posted
10/22/2021
Taxonomy (ARC-IT) Variable Speed Limits (TM20)

Field Tests on State Route 78 in California Showed That Variable Speed Advisory (VSA) Signs Can Increase Average Travel Speeds by 8.71 Percent During Morning Peak Hours.

METHODOLOGY This study first tested the VSA algorithm in a microsimulation model to replicate the actual freeway environment and then implemented it in the field. A website for real-time traffic…
Content type
Date Posted
10/22/2021
Taxonomy (ARC-IT) Variable Speed Limits (TM20)