A new approach to speed-flow curves

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    Abstract

    We develop a simple model of travel time as a function of travel demand, using loop detector data of travel times and traffic flows on a Danish motorway. Our goal is a model that avoids the potential endogeneity problems related to modelling travel time as a function of observed traffic flow. Instead, we employ the assumption that observed traffic flow is exogenous (and equal to demand) before congestion sets in, such that it can be used to predict when this happens. We model a single-peak scenario (morning/afternoon) with two traffic states: Uncongested and congested. We refer to the times of transition between the states as breakdown time (TB) and recovery time (TR). We estimate a simple distribution of travel times for each state, and we model TB and TR using duration models with exponential hazard rates depending on observed traffic conditions. The model predicts travel times by first predicting TB and TR and then applying the estimated travel time distributions.
    Original languageEnglish
    Publication date2014
    Number of pages1
    Publication statusPublished - 2014
    EventThe first Nordic meeting on transport economics - Institute of Transport Economics, Oslo, Norway
    Duration: 26 Nov 201427 Nov 2014

    Conference

    ConferenceThe first Nordic meeting on transport economics
    LocationInstitute of Transport Economics
    CountryNorway
    CityOslo
    Period26/11/201427/11/2014

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