Results 211 to 220 of about 7,125 (256)

Time and space: The difference between following time headway and distance headway instructions

Transportation Research Part F: Traffic Psychology and Behaviour, 2013
In order to guarantee safety, drivers are advised to keep large enough headways. However, headway advice is often provided in terms of time headway, without knowing whether this is the right way of presenting the advice. According to a psychophysics theory, attaining a time headway would indeed allow drivers to show higher headway choice accuracy ...
Malte Risto, Marieke H Martens
exaly   +4 more sources

The effect of time headway feedback on following behaviour

Accident Analysis and Prevention, 1997
A 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.
Andrew May, Stephen Fairclough
exaly   +3 more sources

A comparison of headway and time to collision as safety indicators

Accident Analysis and Prevention, 2003
The two safety indicators "headway" and "time to collision (TTC)" are discussed and compared with respect to their usefulness in determining the safety of different traffic situations, like different locations in a junction. Over a 6-day-period traffic flow measures were taken in a four-way junction with stop signs on the minor road.
exaly   +3 more sources

Time-Headway Distributions on an Expressway: Case of Bangkok

Journal of Transportation Engineering, 2015
Traffic flow modeling is one of the fundamental keys to solving a traffic engineering problem. Among many parameters, time headway is frequently used to model traffic flow characteristics. A statistical analysis of time headways is immensely important to both theoretical traffic modeling and simulation-based traffic modeling.
Sooksan Panichpapiboon
exaly   +2 more sources

Statistical Models for Preferred Time Headway and Time Headway of Drivers in Steady State Car-Following

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
openaire   +1 more source

Monitoring time-headway in car-following task

CHI '08 Extended Abstracts on Human Factors in Computing Systems, 2008
This 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, MARIANI, Michele, MININ, Luca, MONTANARI, Roberto   +3 more
openaire   +1 more source

An Improved Variable Time Headway Strategy For ACC

Proceedings of the 2019 International Conference on Robotics, Intelligent Control and Artificial Intelligence, 2019
The spacing strategy is the basis of the adaptive cruise control strategy, it plays an important role in the design of the ACC system. It requires us to allocate the car spacing according to the environment in which the vehicle is traveling, and improve the utilization of the road under the premise of ensuring driving safety.
Zhongshun Jiang, Huanhuan Zhang, Bo Yang
openaire   +1 more source

Preferred time-headway of highway drivers

ITSC 2001. 2001 IEEE Intelligent Transportation Systems. Proceedings (Cat. No.01TH8585), 2002
The preferred time-headway of drivers in highway conditions is related to the likelihood of rear-end collisions. We studied traffic data from a section of southbound highway 101- a heavily commuted eight-lane freeway between San Francisco and the Silicon valley in California. We observed two parameters that drivers regulate during free flow, rush hour,
T.J. Ayres, L. Li, D. Schleuning, D. Young   +3 more
openaire   +1 more source

Headway Times on Urban, Multiple Lane Freeways

Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 2022
Transportation departments commonly suggest following lead vehicles with headway times of two seconds or more. However, research has shown that headway times of under two seconds are common and that headway times vary across different roadway types. Here, we obtained and analyzed traffic video footage to measure headway times on four- and five- lane ...
Danielle R. King, Amber Gold, Kyra B. Phillips, David A. Krauss   +3 more
openaire   +1 more source