Application of VISSIM in Public Transit Facilities Analysis and Evaluation

2013 ◽  
Vol 361-363 ◽  
pp. 2293-2296 ◽  
Author(s):  
Hong Zhou Cai ◽  
Shou Feng Ma ◽  
Li Wei
Keyword(s):  
Public Transit ◽  
Urban Transportation ◽  
Mutual Interference ◽  
Simulation Software ◽  
Level Of Service ◽  
Microscopic Simulation ◽  
Bus Priority ◽  
Left Turn ◽  
Analysis And Evaluation ◽  
Tianjin City

The level of service and efficiency of public transit facilities affect the functions of urban transportation. VISSIM as a microscopic simulation software is conducted to model the operation processes of public transit facilities in the Huayuan intersection located in Tianjin city of China. Three problems are found in this study as following: seriously mutual interference between buses and cars nearby the transit facilities, deficient capacity of left-turn lanes, serious delay at the intersection including buses and cars. Some improved measures are proposed to solve these problems in the research such as changing the location of bus stops, placing bus priority signs and adding lanes. These measures compose three improved schemes. The effects of these schemes are compared from travel times, delay, queue length and bus waiting time. The simulating results show that these schemes can effectively increase the speed of buses and reduce their delay at the intersection.

scholarly journals Influence of Strong Light on the Performance of Piezoresistive Pressure Sensor

2021 ◽  
Author(s):  
Mimi Huang ◽  
Libo Zhao ◽  
Zutang Wu ◽  
Xiangguang Han ◽  
Mingzhi Yu ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Simulation Software ◽  
Reflection Effect ◽  
Microscopic Simulation ◽  
Strong Light ◽  
Suppression Effect ◽  
Pressure Surface ◽  
Reflective Layer ◽  
Influence Mechanism ◽  
Piezoresistive Pressure Sensor

Abstract It is found that the strong light in the explosion field has great interference to the piezoresistive pressure sensor, then the shock wave data obtained by the sensor is distorted badly. To study the influence mechanism of the strong light on the piezoresistive pressure sensor, a strong light experimental platform is built. The positions of the sensor and the light source are adjusted, and the outputs of the piezoresistive pressure sensor are observed. Through microscopic simulation, the influence of different light intensities on the piezoresistive pressure sensor is analyzed. In order to reduce the influence of strong light on the performance of piezoresistive pressure sensor, we propose to add a reflective layer on the pressure surface of the sensor. The light reflection effects of different film thicknesses are analyzed through film simulation software. At the same time, the reflection effect is verified through experiments. To explain the effect of the reflective layer on the suppression of strong light, a simulation model is established, and the suppression effect of the reflective layer is verified.

Evaluation of Walkability and Pedestrian Level of Service

2017 ◽  
pp. 30-57 ◽  
Author(s):  
Hediye Tuydes-Yaman ◽  
Pinar Karatas
Keyword(s):  
Public Transit ◽  
Research Effort ◽  
Sustainable Transportation ◽  
Clear Relationship ◽  
Level Of Service ◽  
Urban Regions ◽  
Pedestrian Level Of Service

Due to decreasing resources, living in urban regions focus on sustainability in many aspects, including transportation. Sustainable transportation encourages non-motorized modes of walking and cycling as well as public transit (which also relies on walking while accessing a station), as well. However, walking as a mode is still a big mystery itself that needs further attention and research effort especially in the evaluation part. So far, the planners have discussed the concepts of walking and walkability, while engineers have mostly focused on Pedestrian Level of Service (PLOS). The scope of the problem is reflected in the diversity, and consequent inconsistency, in the available PLOS methods, which is one of the problems addressed in this chapter. The second and the bigger problem is the gap between the planning and engineering approaches in evaluating PLOS and walkability producing no consensus or clear relationship between the two, even though they overlap greatly.

scholarly journals The Impact of Emergency Parking Bays on Quasi-Eight-Lane Expressway Traffic Operations

2020 ◽  
Vol 12 (8) ◽  
pp. 3432
Author(s):  
Zhen Yang ◽  
Xiaocan Chen ◽  
Dazhi Sun
Keyword(s):  
High Volume ◽  
Traffic Volume ◽  
Simulation Software ◽  
Traffic Operations ◽  
Microscopic Simulation ◽  
Lane Changing ◽  
Traffic Demand ◽  
The Road ◽  
Traffic Operation ◽  
The Impact

Recently, with the discrepancy between increasing traffic demand and limited land resources, more and more expressways are choosing to use hard shoulders to expand into quasi-six-lane or quasi-eight-lane roads. Therefore, more emergency parking bays are used in place of traditional parking belts. However, there are no standards defining clear and unified specifications for the design of parking bays. This paper aimed to investigate the impact of emergency parking bays on expressway traffic operations with various traffic volumes and setting conditions. Based on the Monte Carlo method, VISSIM (Verkehr in Städten Simulation, a microscopic simulation software) simulation experiments were conducted using measured traffic operation data from one expressway in Zhejiang province. The probability of unsafe deceleration, lane-changing maneuvers and delay times were considered as the safety and efficiency indexes in this simulation study. The simulation results indicated that the emergency parking vehicle had an increasing impact on the following vehicle as the traffic volume increased. However, the impact pattern was found to be insensitive to the changing of the bay taper length. For low traffic volume, compared with the arrival vehicle, the departure vehicle had more impact on the traffic operation of the mainline. However, the impact of the arrival vehicle became more remarkable as the traffic volume increased. After parking, the waiting time for merging into the mainline was reduced as the volume decreased or as the bay taper increased. Furthermore, reductions caused by varying bay tapers were more significant under high volume conditions. Finally, this study suggests that parking bays are inapplicable when the occupancy of the road space exceeds 20% (about 3000 veh/h), because they would cause significant impact on the safety and efficiency of the expressway. The results of this paper are useful for the design and implementation of emergency parking bays.

scholarly journals Evaluating the Performance of Public Transit System: A Case Study of Eleven Cities in China

2019 ◽  
Vol 11 (13) ◽  
pp. 3555 ◽  
Author(s):  
Di Yao ◽  
Liqun Xu ◽  
Jinpei Li
Keyword(s):  
Production Efficiency ◽  
Public Transit ◽  
Bus Priority ◽  
Operational Effectiveness ◽  
Transit System ◽  
Large Cities ◽  
Service Effectiveness ◽  
Measurement Framework ◽  
Mega Cities ◽  
Better Than

This paper presents a super efficiency network Data Envelopment Analysis (SE-NDEA) model for eleven cities in China. The model focuses on measuring the performance of public transit system by integrating multiple stakeholders involved in public transit system with the exogenous environment in where they operated. Thus, local authority, bus operators, passengers, uncontrollable environmental factors, and the externality of public transit are all taken into account in the measurement framework. They are interrelated inputs and outputs. The measurement framework can simultaneously capture each public transit system’s production efficiency, service effectiveness, and operational effectiveness. Meanwhile, undesirable outputs, uncontrollable factors, and boundary-valued variables are considered. The paper evaluates the performance of public transit system of 11 Chinese cities from 2009 to 2016. The results reveal that the exogenous environment has a marked impact on the performance measurement of public transit system. Super cities tend to perform better than mega cities, and mega cities tend to perform better than large cities. Furthermore, service effectiveness has a significantly positive correlation with production efficiency, and transit rail tends to perform better than the conventional bus. These findings have an important implication for China’s bus priority implement and more general managerial insights for public transit development.

Key Technologies in Design and Realization of Simulation Software for the Satellite Experimentations’ Inversion

2012 ◽  
Vol 241-244 ◽  
pp. 2872-2877
Author(s):  
Lei Shi ◽  
Zhi Li ◽  
Can Xu ◽  
Yong Zhe Shao
Keyword(s):  
Observational Data ◽  
Software Design ◽  
Design Method ◽  
Simulation Software ◽  
Inverse Theory ◽  
Analysis And Evaluation ◽  
Overall Design ◽  
Key Technologies ◽  
Developing Platform ◽  
Energy Conservation Principle

To fulfill the requirements of processing, analysis and inversing the observational data of experimentations, simulation software for the inversion of satellite experimentations is designed and developed independently on the developing platform of Qt, based on satellite observational data inverse theory. It provides a simulation and calculation platform for analysis and evaluation of space tests. By using dynamics principle and energy conservation principle, the software resolves inverse problems in satellite orbital dynamics. This article mainly presents the function and design method of the software, explains the design goals, shows the overall design framework, and emphasizes key technologies and countermeasures in process of the software design and realization. The software could be used to investigate the inversion of observational data and evaluate technologic indexes in satellite tests.

scholarly journals EVALUATION OF BUS PRIORITY SYSTEM WITH MICROSCOPIC SIMULATION MODEL

2006 ◽  
Vol 23 ◽  
pp. 945-953 ◽  
Author(s):  
Madhu ERRAMPALLI ◽  
Masashi OKUSHIMA ◽  
Takamasa AKIYAMA
Keyword(s):  
Simulation Model ◽  
Microscopic Simulation ◽  
Bus Priority ◽  
Priority System

An Evaluation Model for Traffic Guidance Measures of the Urban Central Commercial District and its Application

2012 ◽  
Vol 253-255 ◽  
pp. 1695-1699
Author(s):  
Miao Cui ◽  
Tie Xin Cheng ◽  
Jing Zhu Chen
Keyword(s):  
Traffic Flow ◽  
Evaluation Model ◽  
Heavy Traffic ◽  
Simulation Software ◽  
Left Turn ◽  
Traffic Jam ◽  
The Road ◽  
Dynamic Assignment ◽  
Assignment Model ◽  
Traffic Guidance

As the city’s economic and cultural center, the urban Central Commercial Districts (CCDs) are rapidly developing, which always brings the heavy traffic jam in the city. In this paper, the traffic flow of CCDs was analyzed, and the traffic flow guidance evaluation model was established. Firstly, according to the travel time function, traffic flow was allocated to the road network of the CCDs by the dynamic assignment model, and the heavy-traffic roads were identified. Then, traffic flow guidance measures mainly including forbidding straight, left turn, or right turn were given, and the evaluation model above was applied to select the optimal measure. Finally, with VISSIM simulation software, the model was applied to the Tianjin Binjiangdao CCD, which illustrated that the satisfied guidance measure can be selected effectively.

Understanding Differences in Public Transit: Comparison of Boston and Toronto

1997 ◽  
Vol 1604 (1) ◽  
pp. 9-17 ◽  
Author(s):  
Paul Schimek
Keyword(s):  
Population Density ◽  
Public Transit ◽  
Operating Costs ◽  
Level Of Service ◽  
Massachusetts Bay ◽  
Transit System ◽  
Transit Systems ◽  
Transit Service ◽  
American Cities ◽  
The City

Public transit systems in Toronto and Boston, two North American cities of similar size and income, are compared. Although Boston has a reputation as a transit-oriented city, there are about twice as many public transit trips in Toronto. Transit service in Toronto runs, on average, twice as frequently as service in Boston on a network of similar size. This level of service can be supported in part because population density does not decrease as much with increasing distance from the center of the city and because employment is more centralized. The transit system in Boston is constrained from emulating the Toronto transit system not only by a less transit-favorable distribution of population and employment but also by operating costs that are twice as high. The Massachusetts Bay Transit Authority’s higher costs are the result of more fringe benefits for employees and disproportionately more managers and fixed facilities.

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