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Estimating arterial link speed using conventional road detectors

Author

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  • Thirayoot Limanond
  • Nrachai Tuntiworawit

Abstract

In response to an initiative to develop an advanced traffic information system in Bangkok, this paper explores practical guidelines for the optimal location of road sensors, such that the data collected on spot speeds reflect an entire link's average speed. In particular, the authors use microsimulation software to investigate optimal detector locations, using the sum of squared errors and root mean squared errors. The analysis hypothesizes that road segments are 0.4, 0.6, 0.8, 1.0, 2.0 and 3.0 km in length and are specially designed to replicate typical arterial streets in Bangkok. The results show that a single detector location can produce good estimates of link speed only for segments that are shorter than 1.0 km. For distances of 1.0 km or more, the results suggest that two detectors be used for good link speed estimates under all traffic conditions.

Suggested Citation

  • Thirayoot Limanond & Nrachai Tuntiworawit, 2011. "Estimating arterial link speed using conventional road detectors," Transportation Planning and Technology, Taylor & Francis Journals, vol. 34(3), pages 231-243, January.
    • Handle: RePEc:taf:transp:v:34:y:2011:i:3:p:231-243
    DOI: 10.1080/03081060.2011.565171
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