Merging process of U-turns at uncontrolled median openings under mixed traffic conditions
At an uncontrolled median opening, the limited priority situation and the high degree of heterogeneity in traffic stream make the merging manoeuvre of U-turning vehicles very much complex. This study is an attempt to understand this merging manoeuvre. The different types of merging manoeuvres have b...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Vilnius Gediminas Technical University
2018-01-01
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| Series: | Transport |
| Subjects: | |
| Online Access: | https://journals.vgtu.lt/index.php/Transport/article/view/193 |
| _version_ | 1818874405634179072 |
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| author | Gourab Sil Smruti Sourava Mohapatra Partha Pratim Dey Satish Chandra |
| author_facet | Gourab Sil Smruti Sourava Mohapatra Partha Pratim Dey Satish Chandra |
| author_sort | Gourab Sil |
| collection | DOAJ |
| description | At an uncontrolled median opening, the limited priority situation and the high degree of heterogeneity in traffic stream make the merging manoeuvre of U-turning vehicles very much complex. This study is an attempt to understand this merging manoeuvre. The different types of merging manoeuvres have been identified in the field and accordingly classified into different categories. Depending upon the number of vehicles that can merge all together into the opposing through traffic by accepting a single gap, the merging has been classified into two types: single entry merging and multiple entry merging. On the other hand, based on the situation of priority of movement, the merging process is divided into another two categories: ideal merging and forced merging. More explicitly, the ideal merging is split into free merging and Swift Merging (SM). In addition, the forced entry merging is categorized into Gradual Merging (GM) and Aggressive Merging (AM). Time distance diagrams for different types of merging are presented for their better understanding. Field data collected at seven median openings located on various 6-lane divided urban roads are used to analyse different types of merging in a mixed traffic situation. All vehicles plying on the road are divided into 5 categories such as car, motorized two-wheeler (2-W), motorized three-wheeler (3-W), Sports Utility Vehicle (SUV), and Light Commercial Vehicle (LCV) and the merging behaviour of these categories of vehicles have been studied. The effect of influencing parameters like opposing traffic volume and delay on merging are investigated. Mathematical relations are developed between Merging Time (MT) of a vehicle type and the opposing traffic volume. To address the effect of Service Delay (SD) on the MT of a vehicle, models are proposed between SD and MT for all the five categories of vehicles. The two types of merging; gradual and swift are prominently observed in field. The time required by different categories of vehicles for these two merging at various traffic volume levels are determined. Finally, two-tailed t-test is conducted to see if the MT for the two different types of merging is statistically different.
First published online 26 October 2016 |
| first_indexed | 2024-12-19T13:10:05Z |
| format | Article |
| id | doaj.art-3cf439f328ea4b718d77b6a64ff515df |
| institution | Directory Open Access Journal |
| issn | 1648-4142 1648-3480 |
| language | English |
| last_indexed | 2024-12-19T13:10:05Z |
| publishDate | 2018-01-01 |
| publisher | Vilnius Gediminas Technical University |
| record_format | Article |
| series | Transport |
| spelling | doaj.art-3cf439f328ea4b718d77b6a64ff515df2022-12-21T20:19:57ZengVilnius Gediminas Technical UniversityTransport1648-41421648-34802018-01-0133210.3846/16484142.2016.1247295Merging process of U-turns at uncontrolled median openings under mixed traffic conditionsGourab Sil0Smruti Sourava Mohapatra1Partha Pratim Dey2Satish Chandra3Dept of Civil Engineering, Indian Institute of Technology Bombay, IndiaDept of Civil Engineering, Indian Institute of Technology (Indian School of Mines) Dhanbad, IndiaSchool of Infrastructure, Indian Institute of Technology Bhubaneswar, IndiaCSIR – Central Road Research Institute, New Delhi, IndiaAt an uncontrolled median opening, the limited priority situation and the high degree of heterogeneity in traffic stream make the merging manoeuvre of U-turning vehicles very much complex. This study is an attempt to understand this merging manoeuvre. The different types of merging manoeuvres have been identified in the field and accordingly classified into different categories. Depending upon the number of vehicles that can merge all together into the opposing through traffic by accepting a single gap, the merging has been classified into two types: single entry merging and multiple entry merging. On the other hand, based on the situation of priority of movement, the merging process is divided into another two categories: ideal merging and forced merging. More explicitly, the ideal merging is split into free merging and Swift Merging (SM). In addition, the forced entry merging is categorized into Gradual Merging (GM) and Aggressive Merging (AM). Time distance diagrams for different types of merging are presented for their better understanding. Field data collected at seven median openings located on various 6-lane divided urban roads are used to analyse different types of merging in a mixed traffic situation. All vehicles plying on the road are divided into 5 categories such as car, motorized two-wheeler (2-W), motorized three-wheeler (3-W), Sports Utility Vehicle (SUV), and Light Commercial Vehicle (LCV) and the merging behaviour of these categories of vehicles have been studied. The effect of influencing parameters like opposing traffic volume and delay on merging are investigated. Mathematical relations are developed between Merging Time (MT) of a vehicle type and the opposing traffic volume. To address the effect of Service Delay (SD) on the MT of a vehicle, models are proposed between SD and MT for all the five categories of vehicles. The two types of merging; gradual and swift are prominently observed in field. The time required by different categories of vehicles for these two merging at various traffic volume levels are determined. Finally, two-tailed t-test is conducted to see if the MT for the two different types of merging is statistically different. First published online 26 October 2016https://journals.vgtu.lt/index.php/Transport/article/view/193mergingmedian openingmixed trafficservice delayopposing traffic |
| spellingShingle | Gourab Sil Smruti Sourava Mohapatra Partha Pratim Dey Satish Chandra Merging process of U-turns at uncontrolled median openings under mixed traffic conditions Transport merging median opening mixed traffic service delay opposing traffic |
| title | Merging process of U-turns at uncontrolled median openings under mixed traffic conditions |
| title_full | Merging process of U-turns at uncontrolled median openings under mixed traffic conditions |
| title_fullStr | Merging process of U-turns at uncontrolled median openings under mixed traffic conditions |
| title_full_unstemmed | Merging process of U-turns at uncontrolled median openings under mixed traffic conditions |
| title_short | Merging process of U-turns at uncontrolled median openings under mixed traffic conditions |
| title_sort | merging process of u turns at uncontrolled median openings under mixed traffic conditions |
| topic | merging median opening mixed traffic service delay opposing traffic |
| url | https://journals.vgtu.lt/index.php/Transport/article/view/193 |
| work_keys_str_mv | AT gourabsil mergingprocessofuturnsatuncontrolledmedianopeningsundermixedtrafficconditions AT smrutisouravamohapatra mergingprocessofuturnsatuncontrolledmedianopeningsundermixedtrafficconditions AT parthapratimdey mergingprocessofuturnsatuncontrolledmedianopeningsundermixedtrafficconditions AT satishchandra mergingprocessofuturnsatuncontrolledmedianopeningsundermixedtrafficconditions |