Study of vehicle movements in mixed traffic flow at junctions

The capacity at a junction is affected by the proportion of Heavy-Goods-Vehicles (HGVs). The understanding of the behaviour of HGVs at junctions is critical in estimating the efficiency of a junction in terms of the junction capacity. HGVs impose a significant effect on traffic flow at junctions due...

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Main Author: Nadia Raihanah Haron Narasip
Other Authors: Wong Yiik Diew
Format: Final Year Project
Language:English
Published: 2014
Subjects:
Online Access:http://hdl.handle.net/10356/60047
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-600472023-03-03T17:10:11Z Study of vehicle movements in mixed traffic flow at junctions Nadia Raihanah Haron Narasip Wong Yiik Diew School of Civil and Environmental Engineering Dora Chai Chen DRNTU::Engineering::Civil engineering::Transportation The capacity at a junction is affected by the proportion of Heavy-Goods-Vehicles (HGVs). The understanding of the behaviour of HGVs at junctions is critical in estimating the efficiency of a junction in terms of the junction capacity. HGVs impose a significant effect on traffic flow at junctions due to their large size. HGVs constitute the second largest vehicle population on Singapore roads. Statistics in 2013 released by the Land Transport Authority (LTA) recorded an increase in goods-vehicles from a population of 159,768 in 2011 to that of 160,417 in 2012. In this study, the efficiency of a junction is determined by analysing its capacity and safety. Capacity is analysed with the aid of parameters such as average travel times and queue lengths while safety is analysed by identifying the conflict areas at a junction and how regular the conflict arises. PTV VISSIM is utilised in the later part of the project to create simulations which are instrumental to obtain data on the relevant parameters in determining the efficiency of a junction. However, before simulations can be conducted, the data extracted from the videos taken at these junctions selected for study are analysed. Software packages such as Microsoft Excel and Avidemux are used to organise and collate data and to note the instances when the traffic signals change phases, respectively. These procedures are implemented so that simulations of these junctions can be replicated to model the usage of the junction in reality. The analysis of the results from PTV VISSIM will follow. The results obtained from PTV VISSIM include the average vehicle travel times, queue lengths and trajectory motion of the vehicles. The variables aforementioned determine how each vehicle types, mainly cars and HGVs, are affected by increase in HGV volume. In addition, Surrogate Safety Assessment Model (SSAM) is also utilised in the project to determine the frequency and type of collisions at the junctions as well as the average time to collision between vehicles. The results obtained from both PTV VISSIM and SSAM will indicate how increasing HGV volume affects different junction types in terms of their efficiency. After which, comparisons will be made with conventional methods which are based on equations, such as the Webster method and HCM, to identify the pros and cons of using PTV VISSIM to determine junction efficiency. Bachelor of Engineering (Civil) 2014-05-22T02:35:48Z 2014-05-22T02:35:48Z 2014 2014 Final Year Project (FYP) http://hdl.handle.net/10356/60047 en Nanyang Technological University 147 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering::Transportation
spellingShingle DRNTU::Engineering::Civil engineering::Transportation
Nadia Raihanah Haron Narasip
Study of vehicle movements in mixed traffic flow at junctions
description The capacity at a junction is affected by the proportion of Heavy-Goods-Vehicles (HGVs). The understanding of the behaviour of HGVs at junctions is critical in estimating the efficiency of a junction in terms of the junction capacity. HGVs impose a significant effect on traffic flow at junctions due to their large size. HGVs constitute the second largest vehicle population on Singapore roads. Statistics in 2013 released by the Land Transport Authority (LTA) recorded an increase in goods-vehicles from a population of 159,768 in 2011 to that of 160,417 in 2012. In this study, the efficiency of a junction is determined by analysing its capacity and safety. Capacity is analysed with the aid of parameters such as average travel times and queue lengths while safety is analysed by identifying the conflict areas at a junction and how regular the conflict arises. PTV VISSIM is utilised in the later part of the project to create simulations which are instrumental to obtain data on the relevant parameters in determining the efficiency of a junction. However, before simulations can be conducted, the data extracted from the videos taken at these junctions selected for study are analysed. Software packages such as Microsoft Excel and Avidemux are used to organise and collate data and to note the instances when the traffic signals change phases, respectively. These procedures are implemented so that simulations of these junctions can be replicated to model the usage of the junction in reality. The analysis of the results from PTV VISSIM will follow. The results obtained from PTV VISSIM include the average vehicle travel times, queue lengths and trajectory motion of the vehicles. The variables aforementioned determine how each vehicle types, mainly cars and HGVs, are affected by increase in HGV volume. In addition, Surrogate Safety Assessment Model (SSAM) is also utilised in the project to determine the frequency and type of collisions at the junctions as well as the average time to collision between vehicles. The results obtained from both PTV VISSIM and SSAM will indicate how increasing HGV volume affects different junction types in terms of their efficiency. After which, comparisons will be made with conventional methods which are based on equations, such as the Webster method and HCM, to identify the pros and cons of using PTV VISSIM to determine junction efficiency.
author2 Wong Yiik Diew
author_facet Wong Yiik Diew
Nadia Raihanah Haron Narasip
format Final Year Project
author Nadia Raihanah Haron Narasip
author_sort Nadia Raihanah Haron Narasip
title Study of vehicle movements in mixed traffic flow at junctions
title_short Study of vehicle movements in mixed traffic flow at junctions
title_full Study of vehicle movements in mixed traffic flow at junctions
title_fullStr Study of vehicle movements in mixed traffic flow at junctions
title_full_unstemmed Study of vehicle movements in mixed traffic flow at junctions
title_sort study of vehicle movements in mixed traffic flow at junctions
publishDate 2014
url http://hdl.handle.net/10356/60047
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