Abstract
The effect of an upgrade and its length is very significant for traffic flow characteristics. Road traffic in developing countries like India is highly heterogeneous comprising vehicles of wide ranging physical dimensions, weight and dynamic characteristics such as engine power, acceleration rate, etc. Due to these variations, the effect of grade on vehicles in heterogeneous traffic may vary significantly among vehicle categories. Variation in the level of the interaction between vehicles on upgrades may result in different sets of traffic flow characteristics. Hence, it is necessary to model traffic flow on upgrades and study, in depth, changes in traffic flow characteristics with alteration in the magnitude of an upgrade and its length. Computer simulation has emerged as an effective technique for modelling traffic flow due to its capability to account for randomness related to traffic. This study is concerned with applying a simulation model of heterogeneous traffic flow, named HETEROSIM, to study the traffic flow characteristics and performance of different vehicle types on upgrades of different magnitudes.
Highlights
Di erent types of vehicles of heterogeneous tra c on Indian roads may be broadly grouped into the following categories: 1. buses; ISSN 1648-4142 print / ISSN 1648-3480 online www.transport.vgtu.lt
Research work reported in this paper is related to the study on the e ect of an upgrade and its length on the performance of di erent vehicle categories under heterogeneous trafc conditions. e methodology adopted for modelling heterogeneous tra c ow on roads having upgrades of di erent magnitudes, the details of analysis and relevant results along with a review of the previous studies are presented
Model Validation When used for studying the e ect of grade, the simulation model HETEROSIM requires data on the free- ow speeds of di erent vehicle types at the start of the sections and acceleration rates of di erent vehicle categories while negotiating a particular gradient, in addition to other relevant data pertaining to the roadway and tra c conditions
Summary
Knowledge of tra c ow characteristics is very important for planning, analyzing, designing and operating roadway systems (Helbing and Greiner 1997; Arasan and Koshy 2005; Kerner and Klenov 2006; Berezhnoy et al 2007; Bonzani 2007; Jakimavičius and Burinskienė 2007, 2009; Junevičius and Bogdevičius 2007, 2009; Akgüngör 2008a, 2008b; Bazaras et al 2008; Gowri and Sivanandan 2008; Youse and Fathy 2008; Antov et al 2009; Beljatynskij et al 2009; Gražulevičienė and Bendokienė 2009). Road tra c in India is highly heterogeneous comprising vehicles of wide ranging physical dimensions, weight and dynamic characteristics. Modelling heterogeneous tra c ow on upgrades of intercity roads cles such as trucks, buses, etc. Under heterogeneous tra c conditions, this variation in speed reduction among di erent vehicle categories can be attributed to their wide ranging physical characteristics such as dimensions, weight, etc. Research work reported in this paper is related to the study on the e ect of an upgrade and its length on the performance of di erent vehicle categories under heterogeneous trafc conditions. E methodology adopted for modelling heterogeneous tra c ow on roads having upgrades of di erent magnitudes, the details of analysis and relevant results along with a review of the previous studies are presented Research work reported in this paper is related to the study on the e ect of an upgrade and its length on the performance of di erent vehicle categories under heterogeneous trafc conditions. e methodology adopted for modelling heterogeneous tra c ow on roads having upgrades of di erent magnitudes, the details of analysis and relevant results along with a review of the previous studies are presented
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