Vmt vehicle miles traveled3/13/2023 The most obvious ways of measuring miles would be to deploy portable GPS systems, keep trip manifests for a sufficiently long period of time, or collect multiple readings from the vehicle’s odometer. The Vehicle Miles Traveled (VMT) are also a key determinant of congestion, emissions, and fatal and non-fatal road traffic accidents. As cars get older, the difference between the four VMT measures tends to increase this implies large discrepancies in the CO 2 emissions that would be saved, for example, when older cars are removed from the fleet, due to natural turnover or when “cash for clunkers” programs are implemented.Īccurate estimates of how much people drive in a specified period of time and/or at a specific location are an important input into infrastructure planning (Caltrans, 2020, National Highway Cooperative Research Program, 2010), policy assessments (e.g., the costs and benefits of tightened fuel economy regulations for passenger and commercial vehicles NHTSA, 2011, NHTSA, 2020), and national and international energy models and energy use forecasts (e.g., the National Energy Modeling System 1). Quantile regressions indicate that the households with higher driving intensity are less responsive to the fuel cost per mile. The price elasticity of VMT (−0.275 to −0.20) is comparable across these four measures. We compare these four measures of annual VMT, seek to identify low/high mileage segments of the fleet, and examine the quality of the data and their internal validity. We compute two additional estimates from the odometer reading, and the trip diary information contained in the NHTS, respectively. We examine different measures of annual miles driven from the 2017 National Household Travel Survey (NHTS), which includes a self-reported and an imputed measure of annual VMT for a nationally representative sample of U.S. An accurate estimate of vehicle miles traveled (VMT) is an essential input into a variety of emissions, climate change, energy and infrastructure-planning models.
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