Papers by Keyword: Headway

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Authors: Mohammad Hesam Hafezi, Amiruddin Ismail
Abstract: Bus networks occupy less space in city streets, and compared to other kinds of public transportation, need less investment cost. An accurate bus operation schedule which considers actual arriving and departure time is essential for bus companies, due to high passenger demand. In real-world cases, there are daily differences in the frequency of bus dispatch from the terminal, and headway of buses between each bus bay along their route, depending on peak hour traffic and resulting congestion. In this research we studied effective parameters for preparation of proper bus operation scheduling. Measures are essential to ensure that buses receive priority over other traffic, if they are to be attractive to passengers. Finally, we suggest some solutions for lessening interval time in headway and frequency scheduling for bus services. Data obtained from an actual bus operation in the city of Tehran in Iran was used in this study.
Authors: Mohammad Hesam Hafezi, Amiruddin Ismail
Abstract: Nowadays, the total volume of passenger trip demand has increased due to population and economic growth. In this situation , government policy encourages people to use public transportation for inter-city trips. In the meantime, buses are the most widely used in transit technology today. The most important issue in buses service is timely arrival. Due to the limited capacity of the streets and increasing car production, we cannot devote a specific lane to bus operation to separate their operation from other traffic. Generally, actual arrival time of buses in comparison to planned arrival time occurs in three scenarios : sooner, on-time, and later. This article represents different scheduling model to achieve timely arrival. For this purpose we tested two different scenarios by actual public bus operation. The data was obtained in the city of Tehran, since Iran was used in this study.
Authors: Cheng Yuan Mao, Yu Long Pei, Guo Zhu Cheng, Li Wei Hu
Abstract: Traffic characteristic on the conditions of ice-and-snow road performance is quite complex and that seriously influenced the capacity of non-signaled intersection. This paper comparatively analyzed the critical gap and headway on the condition of ice-and-snow or normal, and then analyzed the capacity of non-signaled intersection by the acceptability gap theory, and put forward the headway modify coefficient and the non-signaled intersection capacity modify coefficient for ice-and-snow. The results are the complementarities of traffic flow characteristic on ice-and-snow condition, and they are useful for directing setting traffic engineering facilities in the cold zone.
Authors: Li Xin Wu, Guo Zhu Cheng
Abstract: To evaluate the capacity and service level of road section under damaged state accurately, it is necessary to study the quantified influence of damaged pavement on headway and average travel speed of road. In this paper, pot hole’s width, rut depth, crack ratio and gap repair ratio were used as the evaluate indicators of the status of damaged pavement. Based on the parameter that surveyed on different level of damaged pavement sections, the affects of damaged pavement on saturated headway and average travel speed are analyzed. It shows that saturated headway and average travel speed are correlated with urban road grade and pavement’s status.
Authors: Heng Ding, Wu Wei Chen, Wei Hua Zhang, Jun Jie Chen
Abstract: Influenced by a variety of factors, such as driving skill, traffic composition, signal control, traffic management, and traffic environment and so on, the traffic flow characteristic parameter statistics embodies multi-state characteristic which is incapable to describe precisely by using a single distribution model. In order to fit the headway characteristic parameter of multi-state traffic flow, based on the denseness of mixture Gamma distribution, the data could be fitted more accurately with the method of expectation maximization algorithm and by means of controlling the number of branches under the condition of precision beyond 95%. Take actual survey data as the example, this paper compares the fitting errors of negative exponential distribution, Erlang distribution and mixture Gamma distribution and the result shows that the fitting result based on mixture Gamma distribution is closer to actual case.
Authors: Sai Yin Fang, Feng Li
Abstract: Car-following is a radical traffic Car-following theory. Driving behavior and vehicles’ driving characteristic is very important in making intelligent traffic system. This paper investigates the headways of multi-lane, finds that there existed small headway in multi-lane highway in city Changchun, and its percentage can not be negligible, analyses several reasons of changing lanes in the car-following and the headway distributions with the abnormal behavior. Finally the theory small headway is generated by influence of traffic flow and the ratio of the left and right turning is concluded.
Authors: Mohammad Hesam Hafezi, Amiruddin Ismail
Abstract: Nowadays, delays problem are important issue in preparing schedule for public transportation. It is related to behaviour of passengers, behaviour of transportation means and interaction with traffic. Behaviour of passengers are including: demand patterns of passengers, fare payment and waiting time in station and in-vehicle. Behaviour of transportation means included fleet size and frequency of operation. The most interaction between public transportation and others traffic is in traffic congestion. In this paper, we studies different behaviour of passengers duration operation time in two points: in-station and in-vehicle. They are including: arrival rate of passengers, kinds of fare payment and waiting time. For illustrate behaviour of passengers on delays problem we survey they affects in bus operation. Hence, a case study based on an actual public bus operation in Tehran, Iran is used to demonstrate it.
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