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A Variable Speed Limit (VSL) System Using an AI-Based Algorithm on I-24 in Nashville Reduced Traffic Speed Variations by 32.7 Percent to Improve Safety with Limited Impacts on Vehicle Hours of Delay (VHD).

METHODOLOGY Researchers obtained data from commonly available Radar Detection Systems (RDS) on highways to shape the state input of each VSL controller unit. Regarding the action space of the agents…
Content type
Benefit
Date Posted
04/23/2024
Taxonomy (ARC-IT) Variable Speed Limits (TM20)
Geolocation links
Nashville, Tennessee, United States

Invest in Digital/Smart Infrastructure, Electric Vehicles and Charging Infrastructure, and Policies and Regulations for Successful Deployment of Intelligent Mobility Strategies.

Invest in digital/smart infrastructure, electric vehicles and charging infrastructure, and policies and regulations for successful deployment of intelligent mobility strategies. For example,…
Content type
Lesson
Date Posted
04/30/2023
Taxonomy (ARC-IT) Electric Charging Stations Management (ST05), Infrastructure-Based Traffic Surveillance (TM01), Autonomous Vehicle Safety Systems (VS01)
Geolocation links
Tennessee, United States

Integrating Demand Responsive Applications Across Fixed Transit and Transportation Networking Company Operations Can Address 60 Percent of Trips to Improve Traveler Cost, Time, and Equity Measures.

METHODOLOGY The methodology entailed collecting passenger data, creating a sketch planning tool for connecting FRT with DRT and TNC, and determining the operational and economical aspects of…
Content type
Benefit
Date Posted
03/28/2023
Taxonomy (ARC-IT) Transit Fixed-Route Operations (PT02), Dynamic Transit Operations (PT03), Multi-modal Coordination (PT14)
Geolocation links
Tennessee, United States

Machine Learning Assessment of Traffic Signals Coupled With a Ranking Algorithm That Relies on Probe Vehicle Data Can Help Agencies Identify Intersections for Signal Retiming.

Monitor traffic signal performance in real-time. In this project, signal ranking results were calculated utilizing historic traffic data from September 2021. To more accurately represent the current…
Content type
Lesson
Date Posted
01/31/2023
Taxonomy (ARC-IT) Field Equipment Maintenance (SU11), Traffic Signal Control (TM03)
Geolocation links
Tennessee, United States

Initial Deployment Costs for a Wrong-Way Driving Prevention System at an Off-Ramp Ranged from $18,000 to $45,000.

Crashes due to wrong-way driving can occur when a vehicle enters an exit ramp in the opposite direction from the legal traffic flow and continues onto the highway. Researchers in Tennessee evaluated…
Content type
System Cost
Made Public Date
11/29/2021
Taxonomy (ARC-IT) Autonomous Vehicle Safety Systems (VS01), Infrastructure-Based Traffic Surveillance (TM01)
Geolocation links
Nashville, Tennessee, United States

Operate Test Vehicles at Varying Speeds to Ensure Proper Configuration of Wrong-Way Driving Prevention Systems.

Check the camera angle of the detection component and test different vehicle speeds for detection of Wrong-Way Drivers.  A few missed detections were found during test speeds of 30 and 40 mph.…
Content type
Lesson
Date Posted
11/29/2021
Taxonomy (ARC-IT) Autonomous Vehicle Safety Systems (VS01), Infrastructure-Based Traffic Surveillance (TM01)
Geolocation links
Nashville, Tennessee, United States

Tennessee Study Found Work Zone Intrusion Alert (WZIA) Technologies Using Cone Mountable Sensor Lamps Were Most Applicable for Long-Term Stationary Work Zones.

The report presents the following recommendations on suitable use cases for three selected WZIA technologies based on multicriteria analysis consisting of capital cost, performance accuracy, safety…
Content type
Lesson
Date Posted
08/25/2021
Taxonomy (ARC-IT) Work Zone Safety Monitoring (MC07)
Geolocation links
Tennessee, United States

Transportation network company (TNC) usage is associated with decreased vehicle ownership and fewer single occupancy vehicle trips.

The study attempts to broaden the understanding of the interplay among emerging and established modes of transportation by approaching from several angles the question of how shared modes, and…
Content type
Benefit
Date Posted
09/12/2018
Taxonomy (ARC-IT) Transit Stop Request (PT15), Route ID for the Visually Impaired (PT16), Shared Use Mobility and Dynamic Ridesharing (TI06)
Geolocation links
Los Angeles, California, United States   |   Nashville, Tennessee, United States   |   San Francisco, California, United States   |   Washington, District of Columbia, United States   |   Chicago, Illinois, United States   |   Seattle, Washington, United States

Experiences from truck parking information system pilot demonstrate that detectors must be properly oriented to the roadway and should be calibrated daily to maintain high detector accuracy.

Some of the challenges, constraints and drawbacks of the project’s approach are described in the lessons below. Infrastructure Limitations Detectors Detector accuracy is heavily dependent upon…
Content type
Lesson
Date Posted
08/30/2018
Taxonomy (ARC-IT) Freight-Specific Dynamic Travel Planning (CVO09), Road Weather Information for Freight Carriers (CVO10)
Geolocation links
Tennessee, United States
ITS Deployment Evaluation

INTELLIGENT TRANSPORTATION SYSTEMS JOINT PROGRAM OFFICE

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