EFFECTS OF VEHICLE NUMBER FEEDBACK IN MULTI-ROUTE INTELLIGENT TRAFFIC SYSTEMS

2010 ◽  
Vol 21 (08) ◽  
pp. 1081-1093 ◽  
Author(s):  
CHUANFEI DONG ◽  
XU MA ◽  
BINGHONG WANG
Keyword(s):  
Traffic Flow ◽  
High Efficiency ◽  
Arrival Rate ◽  
Mean Velocity ◽  
Feedback Strategy ◽  
Road Users ◽  
Feedback Strategies ◽  
Average Flux ◽  
Traffic Systems ◽  
Real Time Information

We first study dynamics of traffic flow with real-time information and the influence of a new feedback strategy named Vehicle Number Feedback Strategy (VNFS) in a multi-route scenario in which dynamic information can be generated and displayed on the board (the board refers to a variable message sign where information on the routes is displayed) to guide road users to make a choice. In a multi-route scenario, our model incorporates the effects of adaptability into the cellular automaton models of traffic flow and simulation results adopting vehicle number feedback strategy have demonstrated high efficiency in controlling spatial distribution of traffic patterns compared with the other three information feedback strategies, i.e. Travel Time Feedback Strategy (TTFS), Mean Velocity Feedback Strategy (MVFS) and Congestion Coefficient Feedback Strategy (CCFS). We also discuss the influence of expected arrival rate (Vp) at the entrance on the average flux of each route, and we find that the flux adopting VNFS is always the largest at each Vp value among these four feedback strategies.

PIECEWISE FUNCTION FEEDBACK STRATEGY IN INTELLIGENT TRAFFIC SYSTEMS WITH A SPEED LIMIT BOTTLENECK

2011 ◽  
Vol 22 (08) ◽  
pp. 849-860 ◽  
Author(s):  
BOKUI CHEN ◽  
XIAOYAN SUN ◽  
HUA WEI ◽  
CHUANFEI DONG ◽  
BINGHONG WANG
Keyword(s):  
High Efficiency ◽  
Speed Limit ◽  
Traffic Patterns ◽  
Feedback Strategy ◽  
Traffic System ◽  
The Road ◽  
Road Users ◽  
Piecewise Function ◽  
Traffic Systems ◽  
Information Board

The road capacity can be greatly improved if an appropriate and effective information feedback strategy is adopted in the traffic system. In this paper, a strategy called piecewise function feedback strategy (PFFS) is introduced and applied into an asymmetrical two-route scenario with a speed limit bottleneck in which the dynamic information can be generated and displayed on the information board to guide road users to make a choice. Meanwhile, the velocity-dependent randomization (VDR) mechanism is adopted which can better reflect the dynamic behavior of vehicles in the system than NS mechanism. Simulation results adopting PFFS have demonstrated high efficiency in controlling spatial distribution of traffic patterns compared with the previous strategies.

Impact of information feedback strategy on the car accidents in two-route scenario

2018 ◽  
Vol 29 (09) ◽  
pp. 1850081 ◽  
Author(s):  
R. Marzoug ◽  
N. Lakouari ◽  
O. Oubram ◽  
H. Ez-Zahraouy ◽  
L. Cisneros-Villalobos ◽  
...  
Keyword(s):  
Traffic Flow ◽  
Road Safety ◽  
Information Feedback ◽  
Dynamic Information ◽  
Feedback Strategy ◽  
Car Accidents ◽  
New Strategy ◽  
Feedback Strategies ◽  
The Impact

Various feedback strategies are proposed to improve the traffic flow. However, most of these works did not take road safety into consideration. In this paper, we studied the impact of four feedback strategies on the probability of rear-end collisions ([Formula: see text]). We proposed a new feedback strategy named Accidents Coefficient Feedback Strategy (ACFS) in which dynamic information can be generated and displayed on a board at the entrance of two-route scenario with intersection to help drivers to choose the appropriate road. This new strategy can greatly improve road safety and make the flow smooth as possible at the same time. Moreover, the impact of the intersection and boundary rates ([Formula: see text] and [Formula: see text]) on [Formula: see text] is also studied.

FLOW IMPROVEMENT BY PROVIDING PARTIAL TRAFFIC INFORMATION FOR ROAD USERS

2011 ◽  
Vol 22 (02) ◽  
pp. 181-189 ◽  
Author(s):  
XIAO-YAN SUN ◽  
QING-YI HAO ◽  
MU-REN LIU ◽  
BING-HONG WANG
Keyword(s):  
Traffic Information ◽  
Information Feedback ◽  
Mean Velocity ◽  
Traveler Information ◽  
Traffic Models ◽  
Traveler Information Systems ◽  
Road Users ◽  
Model Average ◽  
Average Flux ◽  
Flow Improvement

In this paper, we investigate two two-route traffic models, i.e. asymmetric and symmetric two-route traffic models, with mean velocity information feedback strategy. The simulation results show that, for asymmetric two-route model, average flux can be significantly improved if only partial road information is provided for road users. However, for symmetric two-route model, average flux of the two routes adopting information feedback cannot outweigh the flux of two routes chosen completely at random. We explain the results by studying the vehicle number on two routes. We hope the study may provide a good suggestion to the design of Advanced Traveler Information Systems.

SPEED OF LAST VEHICLE FEEDBACK STRATEGY IN INTELLIGENT TRANSPORTATION SYSTEMS

2011 ◽  
Vol 22 (07) ◽  
pp. 745-753 ◽  
Author(s):  
BOKUI CHEN ◽  
MENGSU CHEN ◽  
ZILING ZHANG ◽  
YANBO XIE ◽  
BINGHONG WANG
Keyword(s):  
Intelligent Transportation Systems ◽  
Intelligent Transportation ◽  
Transportation Systems ◽  
Feedback Strategy ◽  
Traffic Jam ◽  
The Road ◽  
Effective Strategies ◽  
Average Flux ◽  
Traffic Systems ◽  
Core Part

Traffic jam has become a big problem in the development of economy. How to effectively improve the road capacity is becoming the key problem in the research of traffic flow. As the core part of the next generation intelligent transportation systems, the feedback strategy has attracted much attention. In recent years, researchers have proposed many effective strategies. In this paper, a strategy called speed of last vehicle feedback strategy is introduced, and simulated in a two-route scenario with one exit. Result shows that compared with other strategies, this strategy has certain advantages on average flux — a criteria describing traffic capacity of traffic systems. More importantly, the implementation of this strategy is very simple.

scholarly journals Performance of Urban Corridor Using Speed Profile Data of Automobile

2020 ◽  
Vol 3 (10) ◽  
pp. 1-8
Author(s):  
T. Vijay Kumar ◽  
Drisya Manghat ◽  
L. Geetha ◽  
Vivek R. Das
Keyword(s):  
Traffic Flow ◽  
Heterogeneous Traffic ◽  
Speed Profile ◽  
Profile Data ◽  
Mean Velocity ◽  
The Road ◽  
Flow Parameters ◽  
Road Users ◽  
Variation Characteristics ◽  
Urban Corridor

The level of service on urban roads quality experienced by the drivers will be varying it is difficult to study the variations due to heterogeneous traffic flow conditions of Indian urban roads. As per TRB, 2010 macroscopic traffic flow parameters are found to be deficient in capturing the quality of service on urban roads experienced by users. Hence the objective of the study is to develop new methodology to evaluate the urban roads in heterogeneous traffic conditions considering the microscopic parameters of traffic flow in a four-lane divided urban corridor. The speed profile of the motorised two-wheelers both in free flow and peak flow were collected from the urban corridor of Bangalore Karnataka, India. Using GPS based mobile application. From the speed profile data, the speed variation characteristics were studied. The various speed indices considered in the study are VN (Velocity noise), CV (Co-efficient of variation), AN (Acceleration noise), and MVG (Mean Velocity Gradient). The CV is considered as the measure of effectiveness, higher the CV more will be the variation of quality experienced by the road users.

Study on City T-Junction Design under Optimal Scenarios

2014 ◽  
Vol 587-589 ◽  
pp. 2145-2150
Author(s):  
Song Wu ◽  
Yu Chen Huo
Keyword(s):  
Traffic Flow ◽  
Traffic Signal ◽  
Road Users ◽  
Morning Peak ◽  
Minor Road

As the traffic flow is increasing gradually in recent years, a great deal of problems appears at the intersection in China. This existing T-junction has a high morning peak queues on the minor road and a poor safety record for all road users. Under this circumstance, Firstly, we will design and evaluate a traffic signal controlled T-junction by using DMRB guidelines. Furthermore, we will design and evaluate a roundabout by DMRB guidelines and ARCADY. Different components of the traffic flow in this T-junction should be considered in both two designs, such as buses, pedestrians, cyclists and cars.

scholarly journals Experimental investigation of an annular diffuser for axial fans at different inflow profiles

2017 ◽  
Vol 21 (suppl. 3) ◽  
pp. 553-564
Author(s):  
Johannes Walter ◽  
Dieter Wurz ◽  
Stefan Hartig ◽  
Martin Gabi
Keyword(s):  
Power Plants ◽  
High Efficiency ◽  
Outer Wall ◽  
Pressure Recovery ◽  
Shear Stresses ◽  
Axial Fan ◽  
Mean Velocity ◽  
Annular Diffuser ◽  
Axial Fans ◽  
Wall Shear

Axial fans are used in power plants for fresh air supply and flue gas transport. A typical configuration consists of an axial fan and annular diffuser which connects the fan to the following piping. In order to achieve a high efficiency of the con-figuration, not only the components have to be optimized but also their interaction. The present study focuses on the diffuser of the configuration. Experiments are performed on a diffuser-piping configuration to investigate the influence of the velocity profile at the fan outlet on the pressure recovery of the configuration. Two different diffuser inlet profiles are generated, an undisturbed profile and a profile with the typical outlet characteristics of a fan. The latter is generated by the superposition of screens in the inlet zone. The tests are conducted at a high Reynolds number (Re ? 4?105). Mean velocity profiles and wall shear stresses are measured with hydraulic methods (Prandtl and Preston tubes). The results show that there is a lack of momentum at the outer wall of the diffuser and high shear stresses at the inner wall in case of the undisturbed inflow profile. For the typical fan outlet profile it is vice versa. There are high wall shear stresses at the outer wall while the boundary layer of the inner wall lacks momentum. The pressure recovery of the undisturbed inflow configuration is in good agreement with other studies.

scholarly journals A COMPARISON STUDY: TEACHER, PEER AND SELF-FEEDBACK ON STUDENTS ESSAY WRITING

2020 ◽  
Vol 6 (2) ◽  
pp. 168-180
Author(s):  
Imam Sudarmaji ◽  
Marlien Bunga Lifanie
Keyword(s):  
High School ◽  
Senior High School ◽  
Teacher Feedback ◽  
Comparison Study ◽  
Feedback Strategy ◽  
Essay Writing ◽  
Tenth Grade ◽  
Post Test ◽  
Feedback Strategies ◽  
Design Students

The aim of this research was to know whether there are significant affection of reduction language error in students essay writing by using peer, teacher and self-feedback and to investigate which the best one of the strategies on reduction language error in students essay writing. The 126 tenth grade students of one senior high school in Tangerang were chosen as the sample which taken by non-random using purposive sampling. This research used experimental method with three experimental groups design. Students’ test for pre-test and post-test were used by the researcher to collect the data. The hypothesis data was tested using formula of t-test. The result showed that there was a significant effect used peer, teacher and self-feedback on reduction language error in students writing essay at the tenth grade of senior high school, but teacher feedback is better strategy than peer and self-feedback. It means that the three feedback strategies in reducing language error are effective on improving students writing skill and the teacher feedback strategy is the most effective one among the other strategies

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