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Travel Time Estimation and Incident Detection Using Probe Vehicles
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This book presents a study of the use of GPS §equipped probe vehicle to collect traffic data on a §motorway network. Two types of GPS equipped probe §vehicles, active and passive, have been studied. A §passive probe vehicle was considered to provide only §link journey time and a minimum number of probe §vehicles is required for reliable estimation. This §research has studied the distribution of individual §journey times and calculated the sample size of §probe vehicles required in different traffic §conditions. The sample size has shown to be §generally stable for the same link, but may decrease §in heavier traffic. An active probe vehicle was §found to be able to determine vehicle position and §speed at 1 Hz frequency over an entire journey. By §analysing the speed profile of probe vehicles, §journey times can be estimated from fewer probe §vehicles than normally required.
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