Improved Vehicle Length Measurement and Classification from Freeway Dual-loop Detectors in Congested Traffic
Author | : Lan Wu |
Publisher | : |
Total Pages | : 86 |
Release | : 2014 |
ISBN-10 | : OCLC:881695137 |
ISBN-13 | : |
Rating | : 4/5 (37 Downloads) |
Book excerpt: Classified vehicle counts are a critical measure for forecasting the health of the roadway infrastructure and for planning future improvements to the transportation network. Balancing the cost of data collection with the fidelity of the measurements, length-based vehicle classification is one of the most common techniques used to collect classified vehicle counts. Typically the length-based vehicle classification process uses a pair of detectors to measure effective vehicle length. The calculation is simple and seems well defined. In particular, most conventional calculations assume that acceleration can be ignored. Unfortunately, at low speeds this assumption is invalid and performance degrades in congestion. As a result of this fact, many operating agencies are reluctant to deploy classification stations on roadways where traffic is frequently congested.