CN110910650A - Method for calculating traffic capacity of large roundabout - Google Patents

Method for calculating traffic capacity of large roundabout Download PDF

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Publication number
CN110910650A
CN110910650A CN201911348772.3A CN201911348772A CN110910650A CN 110910650 A CN110910650 A CN 110910650A CN 201911348772 A CN201911348772 A CN 201911348772A CN 110910650 A CN110910650 A CN 110910650A
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China
Prior art keywords
width
reduction coefficient
traffic capacity
roundabout
lane
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CN201911348772.3A
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Chinese (zh)
Inventor
潘轶铠
高明
高克林
薛凝
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Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Shanghai Municipal Engineering Design Insitute Group Co Ltd
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Priority to CN201911348772.3A priority Critical patent/CN110910650A/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0125—Traffic data processing
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
    • G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Traffic Control Systems (AREA)

Abstract

The invention provides a method for calculating the traffic capacity of a large roundabout, which is a new method for evaluating the traffic capacity of the roundabout, and improves a Volterpu formula for evaluating the traffic capacity of the roundabout, so that the application range of the formula is expanded to the calculation of the traffic capacity of the roundabout with the width of an interweaving section exceeding 18 m. The method can provide a basic basis for the design and traffic improvement of the large roundabout.

Description

Method for calculating traffic capacity of large roundabout
Technical Field
The invention belongs to the field of urban road traffic planning and design, and particularly relates to a method for calculating the traffic capacity of a large roundabout.
Background
The roundabout has the advantages of simple management means, effective reduction of vehicle delay under the condition of low traffic volume, reduction of traffic accident rate, environment optimization and the like. The utilization rate is high in various urban constructions in China, partial problems of urban traffic are well solved, and a certain positive effect is played.
The roundabout has the advantages of safe driving, convenient management, environment beautification and the like, but the roundabout also has the defects of limited traffic capacity, large occupied area and the like, so that the traffic capacity of the designed roundabout or the current roundabout must be reasonably evaluated in planning and improving the roundabout.
The traffic capacity evaluation method of the conventional roundabout usually adopts methods such as a Wallerjept formula, a temporary formula of the United kingdom environmental division, a formula of the United kingdom transport and road institute, a Newcastle formula and the like.
(1) Volterpu formula
Figure BDA0002334122510000011
In the formula: qMMaximum traffic capacity on interlaced section (vehicle/h)
l-length of interweaving segment (m)
W-width of interweaving segment (m)
e-average width of approach (m) at intersection entrance
Figure BDA0002334122510000012
e1-entrance approach width (m)
e2Width of the island projection (m)
P-ratio of vehicles interlaced in interlaced segment to total vehicles in percent
The formula is suitable for flat areas, and the longitudinal slope is not more than 4%; the range W of the interweaving segment is between 6.1 and 18 m. This method is not applicable to interleaving segment widths greater than 18 m.
(2) British environment ministry of temporary formula
The formula is suitable for conventional circular crossing with priority traffic, and the specific form is as follows:
Figure BDA0002334122510000021
in the formula: q-the capacity of the interleaved section, wherein the truck accounts for 15% of the total number of vehicles, and if the weight of the truck exceeds 15%, the truck needs to be corrected, and the Q value is 85% for design purposes.
(3) Formula of british institute of transportation and road
Figure BDA0002334122510000022
In the formula: q-practical Total traffic Capacity to enter into Ring Cross (Car/h)
Sigma W-sum of all approach basic widths (m)
A-increased area (m) for approach widening2)，A＝∑a
K1Coefficient, 3 way Cross K180(70) (small automobile/hm)
4-way crossing K160(50) (small automobile/hm)
5-way crossing K155(45) (small automobile/hm)
The method is only suitable for intersections with the central island diameter smaller than 25 m.
(4) Formula of pincushion
Q＝K2D
Q-practical Total traffic Capacity (Car/h)
D, the diameter (m) of the inscribed circle, and if the intersection is an elliptical central island, the average value of the major axis and the minor axis is taken.
K2-the coefficients: three-way intersection K2150 (car/h), four-way intersection K2140 (car/h)
The method is also only suitable for circular intersections with the central island diameter smaller than 25 m.
The applicability of the above 4 methods can be found that the above 4 methods cannot be applied to roundabouts with interweaving section widths exceeding 18m, but from the actual roundabouts, domestic large and medium-sized cities often have roundabouts with interweaving section widths far exceeding 18m, which leads to that no search is provided for evaluating the roundabouts. Therefore, the prior formula method needs to be improved so as to be suitable for traffic capacity evaluation of large roundabouts with interweaving section width exceeding 18 m.
Disclosure of Invention
The invention aims to provide a method for calculating the traffic capacity of a large roundabout, which can be suitable for evaluating the traffic capacity of the large roundabout with the width of an interweaving section exceeding 18 m. The calculation method is suitable for large-scale intersections with the width of the interweaving section exceeding 18m by improving and correcting the Volterpu formula.
In order to achieve the purpose, the technical scheme of the invention is as follows: a method for calculating the traffic capacity of a large roundabout is characterized in that the maximum traffic capacity calculation formula on an interweaving section is as follows:
Figure BDA0002334122510000031
in the formula: qMMaximum traffic capacity on interlaced section (vehicle/h)
l-length of interweaving segment (m)
W-width of interweaving segment (m)
e-average width of approach (m) at intersection entrance
e1-entrance approach width (m)
e2Width of the island projection (m)
P is the ratio of the vehicles interwoven in the interweaving section to all vehicles in percentage;
lane reduction coefficient a: when the width of the interweaving section is 18m, the reduction coefficient is 1.0, when one lane is added, the reduction coefficient is 0.96, when the second lane is added, the reduction coefficient is 0.8, and when the third lane is added, the reduction coefficient is 0.77;
lane width reduction coefficient B: the number of the added lanes is 3.25m, the reduction coefficient is 0.97, the number of the added lanes is 3.5m, the reduction coefficient is 1.0, the number of the added lanes is 3.75m, and the reduction coefficient is 1.03.
Detailed Description
The present invention will be described in further detail with reference to the following specific examples.
In order to be suitable for the traffic capacity evaluation of a large-scale roundabout with the width of an interweaving section exceeding 18m, the invention mainly considers the following factors,
1. reduction factor of roundabout multilane
When the traffic capacity of a road section is calculated, along with the increase of the number of lanes, the traffic capacity of a single lane should be correspondingly reduced, the same problem also exists in the roundabout, the roundabout with the interweaving section of 18m can at least comprise 4-5 lanes, and after the width of the interweaving section exceeds 18m, the increased lanes are reduced by considering the whole traffic capacity.
2. Influence factor of lane width on traffic capacity
The lane width is also an important factor influencing the traffic capacity of the road, and the wider lane can effectively improve the driving speed of vehicles on the road section, improve the conversion efficiency of the intersection and further improve the traffic capacity. On the contrary, the narrow lane can reduce the vehicle running speed of the road section, reduce the intersection conversion efficiency and further reduce the traffic capacity.
The method comprehensively refers to a calculation method of road section traffic capacity, and lane reduction correction and lane width correction are carried out on the roundabout with the intersection section exceeding 18m, so that the method can be suitable for calculating the traffic capacity of the ultra-large roundabout.
The improved formula is as follows:
Figure BDA0002334122510000041
in the formula: qMMaximum traffic capacity on interlaced section (vehicle/h)
l-length of interweaving segment (m)
W-width of interweaving segment (m)
e-average width of approach (m) at intersection entrance
e1-entrance approach width (m)
e2Width of the island projection (m)
P is the ratio of the vehicles interwoven in the interweaving section to all vehicles in percentage;
lane reduction coefficient a: when the width of the interweaving section is 18m, the reduction coefficient is 1.0, when one lane is added, the reduction coefficient is 0.96, when the second lane is added, the reduction coefficient is 0.8, and when the third lane is added, the reduction coefficient is 0.77;
lane width reduction coefficient B: the number of the added lanes is 3.25m, the reduction coefficient is 0.97, the number of the added lanes is 3.5m, the reduction coefficient is 1.0, the number of the added lanes is 3.75m, and the reduction coefficient is 1.03.

Claims (1)

1. A method for calculating the traffic capacity of a large roundabout is characterized in that the maximum traffic capacity calculation formula on an interweaving section is as follows:
Figure FDA0002334122500000011
in the formula: qMMaximum capacity on interleaved segments
length of l-interleaving section
W-width of the interleaved section
e-average width of approach at ring intersection
e1Width of entrance approach
e2Width of the island projection
P is the ratio of the vehicles interwoven in the interweaving section to all vehicles in percentage;
lane reduction coefficient a: when the width of the interweaving section is 18m, the reduction coefficient is 1.0, when one lane is added, the reduction coefficient is 0.96, when the second lane is added, the reduction coefficient is 0.8, and when the third lane is added, the reduction coefficient is 0.77;
lane width reduction coefficient B: the number of the added lanes is 3.25m, the reduction coefficient is 0.97, the number of the added lanes is 3.5m, the reduction coefficient is 1.0, the number of the added lanes is 3.75m, and the reduction coefficient is 1.03.
CN201911348772.3A 2019-12-24 2019-12-24 Method for calculating traffic capacity of large roundabout Pending CN110910650A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101364344A (en) * 2008-06-27 2009-02-11 北京工业大学 Road network limitation capacity determining method based on pressure test
US20090099760A1 (en) * 2007-10-16 2009-04-16 Roger Lederman Method and system for expansion of real-time data on traffic networks
CN102194315A (en) * 2010-03-10 2011-09-21 东北林业大学 Method for analyzing traffic capacity of traffic circle
CN103929777A (en) * 2014-05-08 2014-07-16 西安电子科技大学 Vehicle network data distribution congestion control method based on congestion game
CN203931199U (en) * 2014-06-20 2014-11-05 昆明理工大学 A kind of intelligent transportation road capacity note broadcasting system
CN104821086A (en) * 2015-05-26 2015-08-05 中南大学 Method for positioning low-efficient road section combination in large-scale traffic network
CN109345826A (en) * 2018-10-19 2019-02-15 同济大学 A kind of acquisition methods of double stop line signal control Traffic Capacity of Round Crossing
CN110288828A (en) * 2019-06-19 2019-09-27 河海大学 Crossing inlet road traffic capacity calculation method under the influence of the bus stop of upstream bay

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090099760A1 (en) * 2007-10-16 2009-04-16 Roger Lederman Method and system for expansion of real-time data on traffic networks
CN101364344A (en) * 2008-06-27 2009-02-11 北京工业大学 Road network limitation capacity determining method based on pressure test
CN102194315A (en) * 2010-03-10 2011-09-21 东北林业大学 Method for analyzing traffic capacity of traffic circle
CN103929777A (en) * 2014-05-08 2014-07-16 西安电子科技大学 Vehicle network data distribution congestion control method based on congestion game
CN203931199U (en) * 2014-06-20 2014-11-05 昆明理工大学 A kind of intelligent transportation road capacity note broadcasting system
CN104821086A (en) * 2015-05-26 2015-08-05 中南大学 Method for positioning low-efficient road section combination in large-scale traffic network
CN109345826A (en) * 2018-10-19 2019-02-15 同济大学 A kind of acquisition methods of double stop line signal control Traffic Capacity of Round Crossing
CN110288828A (en) * 2019-06-19 2019-09-27 河海大学 Crossing inlet road traffic capacity calculation method under the influence of the bus stop of upstream bay

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
南佩凤: "环形交叉口通行能力与信号控制方法研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 *

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