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Paper Title:
Evaluation of Effectiveness
of Red Light Camera Programme in Perth
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Authors:
Tony Radalj
Abstract:
A study was undertaken
to evaluate effects of red light camera installations at 58 Perth
metropolitan intersections. The cameras had been installed over
the period between 1984 and 1998.
The effects of presence
of cameras were estimated in terms of cost of crashes, rather than
number of crashes, by comparing cost of crashes 'before' against
the cost of crashes 'after' the installation, over the same period
of time. The period of observation varied depending on the date
of installation and availability of crash data. The crash data by
intersection and the corresponding observation periods was extracted
from the database covering the period between 1980 and 1999. Each
intersection period was determined as the maximum period that could
have been observed for comparison purposes within the 20-year crash
data period. Observation periods ranged between 1 and 9.5 years,
with the mean of 5 years. The estimates of camera effects were based
on crash data collected over 292.7 camera-years of presence/operations
at the sample of intersection locations.
Two approaches were considered
in estimating effects of cameras on crash occurrence at the intersections:
(a) differences in cost of all crashes at the sample of intersections;
and
(b) differences in cost of crashes involving vehicles that might
have run red light on the approaching leg in the direction of red
light camera. These cost differences were adjusted using average
annual change in cost of crashes at a control sample of 447 signalised
intersections that had been in operation since 1985.
The paper reports the
findings of this study.
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