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.
Highlights
AND MOTIVATIONIncrease in population, car ownership, and economic activities, especially in urban areas, produced additional pressure on urban transportation systems [1]
Depending on climate and geographic zone there are different perceptions about what are good and what adverse weather conditions. When it comes to transportation system users, ideal weather conditions (IWC) can be described as follows: no precipitation, dry roadway, visibility greater than 0.4 km, wind speed lower than 16 km/h, and temperature above 10°C [5,6,7]
Any type of weather conditions which deviates from IWC and causes changes in driver and traveller behaviour and affect transportation system efficiency should be taken into account
Summary
AND MOTIVATIONIncrease in population, car ownership, and economic activities, especially in urban areas, produced additional pressure on urban transportation systems [1]. Depending on climate and geographic zone there are different perceptions about what are good and what adverse weather conditions. When it comes to transportation system users, ideal weather conditions (IWC) can be described as follows: no precipitation, dry roadway, visibility greater than 0.4 km, wind speed lower than 16 km/h, and temperature above 10°C [5,6,7]. Any type of weather conditions which deviates from IWC and causes changes in driver and traveller behaviour and affect transportation system efficiency should be taken into account. It is often proposed that the impact of weather conditions and climate change should be included in planning and management of transport infrastructure as a mandatory prerequisite [4, 9]
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