Time and distance halo effects of an overtly deployed mobile speed camera

Champness, Philip G., Sheehan, Mary C., & Folkman, Lisa-Marie (2005) Time and distance halo effects of an overtly deployed mobile speed camera. In Road Safety Research, Policing and Education Conference, 14-16 November, Wellington, New Zealand.


This study investigated time and distance halo effects of mobile overt speed cameras. It was hypothesised that there would be a substantial reduction in vehicle speeds at an operational camera site and that this effect would gradually dissipate over distance from the camera vehicle. It was tentatively predicted that vehicles’ speeds may remain below baseline levels for some time after removal of the speed camera. Electronic data loggers were used to accurately record each vehicle’s speed as it crossed a set of induction loops buried in the road. Loops were spaced every 500 metres for 3.5 kilometres of a 100 kph high quality and high volume road section. Speeds were compared with baseline measures for each data collection point and across points. The first hypothesis was supported. There was a significant 6 kph reduction in mean and a 7 kph reduction in 85th percentile vehicle speeds, and the number of vehicles exceeding the speed limit fell from 53 % to 16 % immediately adjacent to the operational camera. However, these effects had completely disappeared by 1,500 metres downstream. Upstream halos were negligible. There was no time halo effect. In conclusion, this research found that mobile overt speed cameras are effective in reducing vehicle speeds. However, the reduction in speed is only for a relatively short distance and in a one-off trial only occurs while the camera is in operation.

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ID Code: 3952
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Keywords: speed enforcement
Subjects: Australian and New Zealand Standard Research Classification > PSYCHOLOGY AND COGNITIVE SCIENCES (170000) > PSYCHOLOGY (170100) > Social and Community Psychology (170113)
Divisions: Current > Research Centres > Centre for Accident Research & Road Safety - Qld (CARRS-Q)
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2005 (please consult author)
Deposited On: 24 Apr 2006 00:00
Last Modified: 29 Feb 2012 13:12

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