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Evaluation of Different Methods to Calculate Heavy-Truck VMT.
| 题名： | Evaluation of Different Methods to Calculate Heavy-Truck VMT. |
| 作者： | HALLMARK, S. L.; LAMPTEY, S. |
| 关键词： | ESTIMATES; HEAVY TRUCKS; TRAFFIC COUNTS |
| 摘要： | Reliable estimates of heavy-truck volumes are important in a number of transportation applications. Estimates of truck volumes are necessary for pavement design and pavement management. Truck volumes are important in traffic safety. The number of trucks on the road also influences roadway capacity and traffic operations. Additionally, heavy vehicles pollute at higher rates than passenger vehicles. Consequently, reliable estimates of heavy-truck vehicle miles traveled (VMT) are important in creating accurate inventories of on-road emissions. This research evaluated three different methods to calculate heavy-truck annual average daily traffic (AADT) which can subsequently be used to estimate vehicle miles traveled (VMT). Traffic data from continuous count stations provided by the Iowa DOT were used to estimate AADT for two different truck groups (single-unit and multi-unit) using the three methods. The first method developed monthly and daily expansion factors for each truck group. The second and third methods created general expansion factors for all vehicles. |
| 报告类型： | 科技报告 |
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