Modelling the Impact of Rain in Traffic Assignment Procedures

Abstract

The efficiency of urban transportation system is un-der the influence of weather conditions. It is necessary to incorporate these impacts into transport system analysis, in order to prepare adequate mitigation measures. Trans-port models are often used in different types of transport system analysis and forecasting of its future characteris-tics. This paper focuses on implementation of the impact of rain in transport modelling, particularly into a traffic assignment process as a part of a macroscopic transport model. This aspect of modelling is important because it can indicate parts of the network where this impact leads to a high volume/capacity ratio, which is a good input for defining mitigation measures. Commonly, transport models do not consider weather impacts in its standard procedures. The paper presents a methodology for cali-brating volume-delay function in order to improve traf-fic assignment modelling in case of rain. The impact of different rain categories on capacity and free-flow speed was quantified and implemented in the volume-delay function. Special attention is given to the calibration of the part of volume-delay function for over-saturated traf-fic conditions. Calibration methodology is applicable for different types of volume-delay functions and presents a solid approach to incorporate weather conditions into common engineering practice.

Study of specific aspects of calculating the throughput of freight trains on two-track railway sections with mixed traffiс

“…Based on methodological recommendations [1] and scientific research [2,3,14], the estimated capabilities of freight trains and their maximum number are expressed as follows: In the above expressions, it is necessary to take into account the order of placing highspeed passenger trains in the schedule of trains available in the Joint Stock Company "Uzbekistan Railways". In particular, taking into account that the movement of high-speed passenger trains is partially carried out in a packet method, the coefficient of displacement of freight trains from the graph is described in scientific research [4,16,19] as follows:…”