United States Department of Transportation
i
Is That Route Really the Most Fuel-Efficient? Pillar 4–2: Proactive Congestion Management
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2023-02-01
[PDF-6.14 MB]
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Alternative Title:Is That Route Really the Most Fuel-Efficient? [Project Title from Cover]
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Edition:Final Report, April 2022 – February 2023
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Abstract:Many travelers use Google Maps to select the route for their trip and the Google recommendation can have a significant impact on traffic congestion. Google recently added a new route option: the most fuel-efficient route. In theory, the algorithm behind this route selection (Route E) examines the current travel conditions on the available routes and estimates typical fuel consumption based on those conditions. This should include acceleration/deceleration events as these change of speed events significantly impact fuel consumption and are a critical aspect of selecting the most fuel-efficient route, especially when comparing freeway general purpose lanes (GPLs) to Express Lanes/Managed Lanes (MLs). Initial testing of the Google Maps algorithm indicates it may not account for these speed changes. This study examines if the new route guidance from Google Maps is accurately identifying the most fuel-efficient routes and tests the RouteE API models. Researchers examined typical travel conditions on GPLs and MLs on two Dallas freeways with MLs. Several vehicles equipped with on-board diagnostic (OBD) data loggers recorded key aspects of the vehicle operations while driving in real-world traffic conditions
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