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System for mapping best locations of speed limit signs to maximize global fuel efficiency

IP.com Disclosure Number: IPCOM000250113D
Publication Date: 2017-Jun-01
Document File: 1 page(s) / 7K

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System for Mapping Best Locations of Speed Limit Signs to Maximize Global Fuel Efficiency

Disclosed is a map-based planning tool that contains an algorithm that combines the Department of Transportation (DOT) formulas for setting speed limit boundaries with a topographical map that shows the slope of the roadway at different points. This tool can optimize the placement of speed limit boundaries and speed limit change signs to support fuel efficiency.

Highway departments have some leeway in the placement of speed limit signs, depending on where the speed limit is changing. For placement, the impact of terrain on fuel efficiency is not commonly considered. If the department must choose between placing the sign at the top or the bottom of a hill, for example, the correct choice (depending on the direction of travel) might save countless thousands of gallons of fuel over the course of a year. For example, the more efficient placement is to post an increased speed limit sign at the top of a hill so the vehicle can use gravity and coasting to increase its speed after it crests the hill. Conversely, placing a reduced speed limit sign at the beginning of an upward incline allows the vehicle to let gravity slow the vehicle as it begins to ascend the hill. The novel contribution is a map-based planning tool that contains an algorithm that combines the Department of Transportation (DOT) formulas for setting speed limit boundaries with a topographical map that shows the slope of the roa...