A Unified Real-time Automatic Congestion Identification Model Considering Weather and Roadway Visibility Conditions

Mohammed Elhenawy, Hesham Rakha, Hao Chen

2016

Abstract

Real-time automatic congestion identification is one of the important routines of intelligent transportation systems (ITS). Previous efforts usually use traffic state measurements (speed, flow, occupancy) to develop congestion identification algorithms. However, the impacts of weather conditions to identify congestion have not been investigated in the existing studies. In this paper, we proposed an algorithm that uses the speed probe data and the corresponding weather and visibility to build a transferable model. This model can be used on any road stretch. Our algorithm assumes traffic states can be classified into three regimes: congestion, speed at capacity and free-flow. Moreover, the speed distribution follows a mixture of three components whose means are functions in weather and visibility. The mean of each component is defined using a linear regression using different weather conditions and visibility levels as predictors. We used three data sets from VA, CA and TX to estimate the model parameters. The fitted model is used to calculate the speed cut-off between congestion and speed at capacity which minimize either the Bayesian classification error or the false positive (congestion) rate. The test results demonstrate the proposed method produces promising congestion identification output by considering weather condition and visibility.

Paper Citation

in Harvard Style

Elhenawy M., Rakha H. and Chen H. (2016). A Unified Real-time Automatic Congestion Identification Model Considering Weather and Roadway Visibility Conditions . In Proceedings of the International Conference on Vehicle Technology and Intelligent Transport Systems - Volume 1: VEHITS, ISBN 978-989-758-185-4, pages 39-48. DOI: 10.5220/0005791400390048

in Bibtex Style

@conference{vehits16,
author={Mohammed Elhenawy and Hesham Rakha and Hao Chen},
title={A Unified Real-time Automatic Congestion Identification Model Considering Weather and Roadway Visibility Conditions},
booktitle={Proceedings of the International Conference on Vehicle Technology and Intelligent Transport Systems - Volume 1: VEHITS,},
year={2016},
pages={39-48},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0005791400390048},
isbn={978-989-758-185-4},
}

in EndNote Style

TY - CONF
JO - Proceedings of the International Conference on Vehicle Technology and Intelligent Transport Systems - Volume 1: VEHITS,
TI - A Unified Real-time Automatic Congestion Identification Model Considering Weather and Roadway Visibility Conditions
SN - 978-989-758-185-4
AU - Elhenawy M.
AU - Rakha H.
AU - Chen H.
PY - 2016
SP - 39
EP - 48
DO - 10.5220/0005791400390048