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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

Coordinated Ramp Metering Systems Implemented in California Showed a Delay Reduction of Up to 9 Percent and Travel Time Reliability Improvement of Up to 28 Percent During Peak Periods.

Methodology In the “before” period (September-October 2016) the I-80 corridor did not utilize ramp metering. The “after” (September-November 2018) ramp metering system was a CRM algorithm based on…
Content type
Date Posted
10/25/2022
Taxonomy (ARC-IT) Traffic Metering (TM05)

Keep Detector Data Quality at 90 Percent or Above at Critical Locations for Successful Operation of the Congestion Responsive Freeway Ramp Metering Strategy.

Maintain loop detection health close to 100 percent and data quality above 90 percent in order to operate CRRM. The operation of Local Responsive Ramp Metering (LRRM) (during peak hours) should be…
Content type
Date Posted
04/26/2022

Simulation of a Coordinated Adaptive Ramp Metering Strategy Showed a Two Percent Increase in Average Weighted Speeds for Combined Ramp and Mainline Traffic.

Methodology Several sites experiencing freeway merge / diverge deficiencies and speed-change areas resulting in capacity reduction were selected for analysis of these control strategies, including:…
Content type
Date Posted
04/07/2022

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

Coordination of Freeway Ramp Metering with Arterial Traffic Signal Control Reduced Total Travel Time and Delay by 5.8 and 11.5 Percent, Respectively, in a California Study.

METHODOLOGY The coordinated ramp metering algorithm takes available on-ramp storage into account and dynamically reduces the cycle length of the feeding intersection signal control in order to avoid…
Content type
Date Posted
02/24/2022

Assess and Quantify Performance of Ramp Metering Systems by Periodically Checking for Data Consistency in Reported Traffic Speeds, Flows, and Occupancies.

Periodically check the traffic data obtained by ramp metering systems (e.g., traffic speeds, flows, and occupancies) to assess and quantify system performance. The system cannot respond to…
Content type
Date Posted
02/24/2022

For Arterial Signals Surrounding Newly Installed Ramp Meters, Use Time-of-Day Plans That Are Checked As Needed Every Three to Six Months over the First 1.5 Years.

Arterial signal timing should be considered for optimal results. Signals surrounding the on‐ramp signals should use time of day plans that are re‐evaluated and re‐timed as needed every three to six…
Content type
Date Posted
10/29/2021