Assessing the major causes of travel time reliability on urban freeways.

Tavassoli Hojati, Ahmad, Ferreira, Luis and Charles, Phil (2009). Assessing the major causes of travel time reliability on urban freeways.. In: 32nd Australasian Transport Research Forum (ATRF), Auckland, New Zealand, (x-x). 29 September – 1 October, 2009.

Author Tavassoli Hojati, Ahmad
Ferreira, Luis
Charles, Phil
Title of paper Assessing the major causes of travel time reliability on urban freeways.
Conference name 32nd Australasian Transport Research Forum (ATRF)
Conference location Auckland, New Zealand
Conference dates 29 September – 1 October, 2009
Convener Heather Staley
Place of Publication Canberra ACT, Australia
Publisher Australian Government: Department of Infrastructure and Transport Research
Publication Year 2009
Sub-type Fully published paper
Start page x
End page x
Total pages 10
Collection year 2010
Language eng
Abstract/Summary Travel time reliability (TTR) has become one of the most important indicators of transportation performance. From a user’s perspective, the reliability of arrival times often ranks as the most important attribute, ahead of total trip travel time. This paper summarises the early findings of a study aimed at quantifying reliability causes so that improved predictive reliability models can be put forward. After dealing with the definition of reliability from different viewpoints, the paper summarises the latest findings related to the causes of travel time variability (TTV) and uncertainty on urban freeways. Both recurrent and non-recurrent congestion are dealt with separately. The causes of TTV are categorized in seven major groups. The relative importance of each of these factors is discussed together with the data collection and analysis methods needed to build TTR predictive models. The paper provides some preliminary findings from the analysis of TTV data for a section of an urban freeway in Brisbane. On the basis of that analysis, some general conclusions are drawn related to the type and the amount of data which must be collected to enable predictive reliability models to be built.
Subjects 120506 Transport Planning
880199 Ground Transport not elsewhere classified
Keyword Transport
Travel time reliability
Traffic incidents
Recurrent and non-recurrent congestion
Q-Index Code E1
Q-Index Status Confirmed Code

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Created: Wed, 25 Nov 2009, 09:04:39 EST by Margaret Pereira on behalf of School of Civil Engineering