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Time Headway on French Rural Roads
IFAC Proceedings Volumes, 2003Abstract This paper presents some empirical time headways observed on rural roads in France, and proposes a model relating the time gaps to the traffic flow, to the percentage of long vehicles, to the number of lanes; the influence of the period of the day is discussed.
Maurice Aron +2 more
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Applications of Advanced Technology in Transportation, 2006
This paper proposes two shifted continuous distribution models for preferred time headway (Tp) and time headway in steady state car-following (Tws), i.e. the lognormal and gamma models. Lognormal distribution with a shaft of 0.21 seconds provides a good fit to Tp, whereas a shift of 0.26 is proposed to Tws.
Ghulam H. Bham', Siva Rama Prasad Ancha
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This paper proposes two shifted continuous distribution models for preferred time headway (Tp) and time headway in steady state car-following (Tws), i.e. the lognormal and gamma models. Lognormal distribution with a shaft of 0.21 seconds provides a good fit to Tp, whereas a shift of 0.26 is proposed to Tws.
Ghulam H. Bham', Siva Rama Prasad Ancha
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Fitting Time Headway–Vehicle Speed Bivariate Distributions
Transportation Research Record: Journal of the Transportation Research Board, 2015Knowledge of traffic flow characteristics at cross sections helps analysts, software developers, and practitioners to identify, model, and simulate traffic flows as inputs in operational analysis. This work presents a complete procedure for constructing bivariate time headway (TH)–vehicle speed (VS) distributions starting from raw traffic data on two ...
Riccardo Rossi +2 more
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Monitoring time-headway in car-following task
CHI '08 Extended Abstracts on Human Factors in Computing Systems, 2008This study investigates the effect of the follower and leader vehicles' speed on time headway variation during deceleration in a car-following task. Significant results were found in deceleration onset; headway varies significantly when absolute and relative follower speed are high. These results suggest possible application in the tuning of in-vehicle
FIORANI, Matteo +3 more
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2014
The time headway process has great practical as well as theoretical significance in highway engineering. The chapter deals with the basics which statistically characterize a process of time intervals between vehicles of a traffic stream.
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The time headway process has great practical as well as theoretical significance in highway engineering. The chapter deals with the basics which statistically characterize a process of time intervals between vehicles of a traffic stream.
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Time to make headway on Agenda for Change
British Journal of Community Nursing, 2002Despite the bounty of the Chancellor’s 2002/2003 budget and the billions of pounds heading for the health service, there is still a long way to go before a final settlement is reached on a new structure for nurses’ pay and conditions. We can only hope that when it arrives it lives up to expectations.
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The effect of time headway feedback on following behaviour
Accident Analysis & Prevention, 1997A field study was conducted to assess the impact of continuous time headway feedback on following behaviour. An equipped vehicle was fitted with a microwave radar connected to a head-down display. The display was supplemented by an auditory tone which sounded if headway decreased below 1 second.
S H, Fairclough, A J, May, C, Carter
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Adaptive Vehicle Following Control System with Variable Time Headways
Proceedings of the 44th IEEE Conference on Decision and Control, 2006In this paper, we design a vehicle following control system with variable time headways, using adaptive control design methodology. It is shown that the designed vehicle following control system guarantees closed-loop system stability, and that it regulates the speed and separation errors towards zero when the lead vehicle is at a constant speed ...
Zhang, J. +3 more
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ANALYSIS OF TIME HEADWAYS ON URBAN ROADS
Civil Engineering and Environmental Systems, 2002Abstract The headway between vehicles in a traffic stream is of fundamental importance in traffic engineering applications. Previous research in this subject has focused on modeling theoretical distributions for low and medium traffic flow conditions. Yet little research has studied congested traffic conditions, that is, the high traffic flow state. In
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Models of Single Lane Time Headway Distributions
Transportation Science, 1976The movement of traffic past a point is compared to the output of a queuing system having random input. A generalization of the queue output model leads to a suitable headway model: this model is a mixture of two distributions, representing following and nonfollowing headways, in appropriate proportions. Thin model is compared with several others that
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