United States Department of Transportation
i
Naturalistic Study of Truck Following Behavior
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2016-04-01
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[PDF-1003.27 KB]
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Edition:Summary report
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NTL Classification:AGR-SAFETY AND SECURITY-SAFETY AND SECURITY;NTL-FREIGHT-Trucking Industry;NTL-SAFETY AND SECURITY-SAFETY AND SECURITY;NTL-SAFETY AND SECURITY-Highway Safety;
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Abstract:Volpe conducted the Naturalistic study of truck following behavior to gain a better understanding of how trucks follow other vehicles in the real world, with the ultimate goal of supporting the Federal Highway Administration in the development of automated truck platooning applications. Using two naturalistic heavy truck data sets collected from previous related research, Volpe quantified heavy truck following behavior in the following categories: how closely trucks follow other vehicles on freeways, how following behavior varies by road condition, weather and visibility, following distances at which cut-in events occur, and the safety impact of different headways. Key results from this 2015 study showed tractor trailer trucks follow passenger cars at shorter distances and headways than they follow heavy trucks at distances under 60 mph, but follow other heavy vehicles at shorter distances and headways at speeds greater than 60 mph; truck drivers generally follow other vehicles at much shorter headways (around 2 seconds) than are recommended in CDL driver handbooks; vehicles rarely cut-in between two trucks who are following at a distance of 40 m or less; and crash risk increases considerably when trucks follow other vehicles at headways of less than 1 s.
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