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Without constant driver supervision, Level 2 Active Driving Systems could collide with hazards such as disabled vehicles in 66 percent of cases.

Methodology To help answer some of the questions around performance of level two active driving systems, a research team from the American Automobile Association (AAA) Foundation for…
10/28/2020
Taxonomy: Collision Avoidance, Adaptive Cruise Control, Intelligent Speed Control, Lane Keeping Assistance

Variable speed limit system in a freeway connected vehicle environment yielded travel time savings of 30 to 80 hours compared to traditional vehicles.

  Findings Simulation results show that CFC systems improve traffic efficiency and substantially change flow characteristics. Despite the significant changes in flow characteristics, the…
Taxonomy: Intelligent Speed Control, Speed Harmonization, Variable Speed Limits

One autonomous vehicle can control the flow of at least 20 human-controlled vehicles around it.

Findings It is not necessary for all vehicles to be automated to benefit from mobile actuation of an autonomous vehicle controller. A single autonomous vehicle can control the…
Taxonomy: Intelligent Speed Control

Simulation model shows that with only 10 percent Connected and Automated Vehicle (CAV) market penetration, implementing a CAV-only lane would degrade overall freeway throughput; however, with 25 percent market penetration, throughput would improve.

FINDINGS  
  • Modeling results showed that with 10 percent CAV market penetration, dedicating a lane exclusively to CAVs will degrade freeway…
12/30/2019
Taxonomy: Intelligent Speed Control

Simulation found that connected vehicles can reduce secondary crash risk by one-third in areas with high-volume traffic and 25 percent connected vehicle market penetration.

FINDINGS Simulation found that connected vehicles can reduce secondary crash risk by one-third in areas with high-volume traffic and 25 percent connected vehicle market penetration. In areas with…
09/18/2019
Taxonomy: Forward Collision Warning, Intelligent Speed Control

Eco-Approach and Departure (EAD) techniques for connected vehicles can save six percent energy for trip segments within range of DSRC enabled signal controllers.

FINDINGS The EAD system effectively reduced the idling or near-idling cases by 22 percent. The EAD system saved two percent energy for all trips, and six percent energy for EAD activated trip…
03/13/2019
Taxonomy: Adaptive Signal Control, Advanced Signal Systems, Eco-Traffic Signal Timing, Connected Eco-Driving, Intelligent Speed Control

Autonomous intersection management algorithms found in simulation to reduce delays at intersections by eight times compared to conventional traffic lights.

FINDINGS The paper's proposed algorithm outperformed all other examined systems over all tested traffic densities. Its average delay in seconds, across all densities, was never higher than .4…
12/21/2018
Taxonomy: Intelligent Speed Control

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.

FINDINGS The 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…
10/30/2018
Taxonomy: Intelligent Speed Control, Speed Harmonization

Cooperative Adaptive Cruise Control (CACC) and Dynamic Speed Harmonization (DSH) applications that share dedicated lanes with HOVs can improve throughput by 21 percent with 10 percent market penetration.

FINDINGS The figure below extracted from the source document shows a comparison of the maximum dedicated lane throughput achieved through CACC implementation at different levels…
10/30/2018
Taxonomy: Intelligent Speed Control, Speed Harmonization

Rapid deployment of DSRC for connected vehicles can save thousands of lives, regardless of whether a later transition to C-V2X proves advantageous.

FINDINGS   The baseline scenario for the analysis assumed that a decision to wait for C-V2X would result in a delay of 5 years (3-year and 7-year delays are also analyzed). For the 5-year…
07/23/2018
Taxonomy: In-Vehicle Systems, Collision Avoidance, Intersection Collision Warning, Road Geometry Warning, Weather Warning, Adaptive Cruise Control, Safety & Security, Intelligent Speed Control, Lane Keeping Assistance, Navigation / Route Guidance, Platooning, In-Vehicle Systems, In-Vehicle Systems, In-Vehicle Systems, In-Vehicle Systems
ITS Deployment Evaluation

INTELLIGENT TRANSPORTATION SYSTEMS JOINT PROGRAM OFFICE

1200 New Jersey Avenue, NE
Washington, DC 20590

1-800-853-1351

its.dot.gov

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Arterial Management

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