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A Simulation Study on Dynamic Speed Harmonization (DSH) Found That Implementing DSH With a 10 Market Penetration Rate of Connected and Automated Vehicles (CAVs) Led to a 9.6 Percentage Point Reduction in Collision Probability.

METHODOLOGY The study used the simulation model of the 1.4-mile-long freeway segment of I-80 in District 4 of California as a test bed and used Caltrans Performance Measurement System (PeMS) data.…
Content type
Benefit
Date Posted
02/25/2025
Taxonomy (ARC-IT) Speed Harmonization (TM21)
Geolocation links
California

Integrate Cooperative Automated Transportation Data with Traditional Sensors for Effective Traffic Management During Low Connected and Automated Vehicle Market Penetration.

Key takeaways from the study are listed below. Integrate CAT data with traditional sensors to provide comprehensive traffic management, particularly during the transition period when CAV market…
Content type
Lesson
Date Posted
09/30/2024
Taxonomy (ARC-IT) Performance Monitoring (DM02), ITS Communications (SU07), Connected Vehicle Traffic Signal System (TM04), Traffic Metering (TM05), Regional Traffic Management (TM07), Traffic Incident Management System (TM08), Speed Harmonization (TM21), Broadcast Traveler Information (TI01), Personalized Traveler Information (TI02), Queue Warning (VS08)
Geolocation links
Los Angeles, California, United States

Connected and Automated Vehicle Data-Enhanced Ramp Metering Simulated on Corridor I-210 Reduced Travel Time by 12 Percent, Speed Variations by Five Percent, and Number of Stops on Mainline by 25 Percent.

METHODOLOGY The case study developed queue-informed and incident-aware enhanced ramp-metering algorithms with CAV data. The former enhanced algorithm employed more accurate on-ramp queue estimations…
Content type
Benefit
Date Posted
09/30/2024
Taxonomy (ARC-IT) Performance Monitoring (DM02), ITS Communications (SU07), Vehicle-Based Traffic Surveillance (TM02), Connected Vehicle Traffic Signal System (TM04), Traffic Metering (TM05), Regional Traffic Management (TM07), Traffic Incident Management System (TM08), Speed Harmonization (TM21), Broadcast Traveler Information (TI01), Queue Warning (VS08)
Geolocation links
Los Angeles, California, United States

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
Benefit
Date Posted
04/07/2022
Taxonomy (ARC-IT) Traffic Metering (TM05), Speed Harmonization (TM21)
Geolocation links
Kansas, United States   |   California, United States   |   Minnesota, United States

Simulation of Connected and Automated Vehicle Applications Shows That Up to 30 Percent More Traffic Demand Can Be Satisfied with Bundled Cooperative Adaptive Cruise Control, Speed Harmonization, and Cooperative Merge at High Market Penetration.

Methodology Researchers conducted a case study based on a 13-mile segment of I-66, between the I–495 interchange and US 29 interchange. Speed and volume data, on- and off-ramp traffic volume data,…
Content type
Benefit
Date Posted
09/27/2021
Taxonomy (ARC-IT) Autonomous Vehicle Safety Systems (VS01), Infrastructure Enhanced Cooperative Adaptive Cruise Control (VS15), Automated Vehicle Operations (VS17), Cooperative Adaptive Cruise Control (VS14), Speed Harmonization (TM21)
Geolocation links
Virginia, United States

Connected and automated vehicles equipped with speed harmonization applications can reduce fuel consumption by 19 to 22 percent.

Methodology Using a microscopic simulation model test bed, the researchers evaluated the proposed control algorithm's performance compared with three other approaches. Baseline - Human…
Content type
Benefit
Date Posted
10/29/2020
Taxonomy (ARC-IT) Speed Harmonization (TM21), Infrastructure Enhanced Cooperative Adaptive Cruise Control (VS15)
Geolocation links
Nationwide, United States

Track testing suggests stop-and-go freeway traffic can be controlled to reduce fuel consumption by 40 percent with as few as 5 percent autonomous vehicles in the traffic stream.

FINDINGSExperimental findings suggested stop-and-go freeway traffic flow can be controlled to improve fuel economy and throughput with as few as 5 percent autonomous vehicles in the traffic stream.In…
Content type
Benefit
Date Posted
09/26/2019
Taxonomy (ARC-IT) Speed Harmonization (TM21), Infrastructure Enhanced Cooperative Adaptive Cruise Control (VS15)
Geolocation links
Nationwide, United States

Track testing suggests stop-and-go freeway traffic flow can be controlled to increase throughput by 15 percent with as few as 5 percent autonomous vehicles in the traffic stream.

FINDINGS Experimental findings suggested stop-and-go freeway traffic flow can be controlled to improve fuel economy and throughput with as few as 5 percent autonomous vehicles in the traffic stream…
Content type
Benefit
Date Posted
09/26/2019
Taxonomy (ARC-IT) Speed Harmonization (TM21), Infrastructure Enhanced Cooperative Adaptive Cruise Control (VS15)
Geolocation links
Nationwide, United States

Simulation shows an optimized CAV control framework can increase the effective capacity of high-volume corridors.

FINDINGS The study found that the introduction of control zones and the optimal control framework significantly decreased following distances for both local and highway traffic. This was primarily…
Content type
Benefit
Date Posted
05/06/2019
Taxonomy (ARC-IT) Intermittent Bus Lanes (PT10), Regional Traffic Management (TM07), Integrated Decision Support and Demand Management (TM09), Speed Harmonization (TM21), Dynamic Lane Management and Shoulder Use (TM22), Restricted Lane Warnings (VS10), Infrastructure Enhanced Cooperative Adaptive Cruise Control (VS15)
Geolocation links
Newark, Delaware, United States

Cooperative Adaptive Cruise Control (CACC) and Dynamic Speed Harmonization (DSH) applications that share dedicated lanes with HOVs can reduce fuel consumption by more than 16 percent.

FINDINGSThe figure below extracted from the source report shows traffic speed profiles on I-66 (WB) and the potential for reduced traffic shockwaves when DSH is combined with CACC at market…
Content type
Benefit
Date Posted
10/30/2018
Taxonomy (ARC-IT) Freight Administration (CVO02), Speed Harmonization (TM21), Autonomous Vehicle Safety Systems (VS01), Infrastructure Enhanced Cooperative Adaptive Cruise Control (VS15)
Geolocation links
Virginia, United States
ITS Deployment Evaluation

1200 New Jersey Avenue, SE
Washington, DC 20590

its.dot.gov

U.S. Department of Transportation Office of the Assistant Secretary for Research and Technology (OST-R)
 
 
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