Microscopic Model for Two-lane Rural Models and Its Application
Annique Lenorzer, TSS - Transport Simulation Systems S.L., Carlos Llorca, Universitat Politècnica De València, Ana Tsui Moreno, Universitat Politècnica De València
The paper presents a model for overtaking maneuvres on two way highways and gives details of its validation as well as its impact on road design.
Microsimulation is a useful tool to analyze traffic operation and mainly has been focused on urban areas and one-lane highways. As a consequence, the evolution of behavioral models has not generally addressed models to represent overtaking maneuvers on two-lane highways, where the complexity of passing and the interaction with oncoming traffic requires specific treatment.
This paper describes the passing maneuver and its decomposition into behavioral models: 1) passing desire, 2) decision and 3) execution. Results of the observation of 1752 maneuvers on 10 rural roads in Spain were used for this development. The model incorporated the effect of new factors such as available sight distance, delay and remaining travel time until the end of the highway segment. Outputs of the model were compared to observed data: firstly, individual passing maneuvers; secondly, traffic flow, percent followers and number of passing maneuvers in four single passing zones with two different traffic levels. The model was validated in four alternative passing zones.
This paper is complemented with a second part that analyses the minimum passing zone length design that considers traffic operational efficiency and safety. A reliability analysis is performed. It quantified the probability that a passing maneuver was completed beyond the end of the passing zone (non-compliant passing maneuvers). Afterwards, the number of non-compliant passing maneuvers was calculated. Traffic flow as well as passing zone length were contributing factors.
The results can be directly used by practitioners to establish the minimum passing zone length based on the range of hourly volumes and the level of risk willing to be taken.
Association for European Transport