Institute of Transport Studies, University of Leeds
Abstract
This working paper is one of a series of three describing
research on travel time variability of car drivers using a north
London corridor. The objectives of the work described in this
report were to determine the amount of variability experienced
within short time periods and between time periods, and to
explain these variations in terms of simultaneously-recorded
traffic factors.
This report describes the methodology used, the surveys carried
out and the data processing procedures. Data were collected on
twelve contiguous links on the A41 between 0730 and 1030 on
weekdays in spring and again in summer. Link travel-time
distributions for cars were obtained by registration-plate
matching using hand-held electronic data loggers. The methods
of treatment of spurious matches and outliers, resulting
respectively from chance matching of partial registration numbers
and from stopping or diverting vehicles, are described. The
reasons for selecting particular explanatory traffic variables
are presented, together with a description of the methods of data
collection.
The results of these surveys and their analysis are contained in
ITS Working Paper 279. The methodology, data collection
procedure and analysis of journey time variability experienced
by a panel of car commuters using the same corridor are contained
in ITS Working Paper 277
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