The impact of average speed over distance (ASOD) systems on speeding patterns along the R61

Ebot Eno Akpa, N. A. ; Booysen, Marthinus J. ; Sinclair, M. (2014-12)

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Ebot Eno Akpa, N. A., Booysen, M. J. & Sinclair, M. 2014. The impact of average speed over distance (ASOD) systems on speeding patterns along the R61, in Proceedings of the First International Conference on the use of Mobile Informations and Communication Technology (ICT) in Africa UMICTA 2014, 9-10 December 2014, STIAS Conference Centre, Stellenbosch: Stellenbosch University, Department of Electrical & Electronic Engineering, South Africa, ISBN: 978-0-7972-1533-7.

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Conference Paper

Speeding is considered to be a major contributing cause of road fatalities in Sub-Saharan Africa and South Africa in particular. The minibus taxi industry is a vibrant yet partly informal sector of public transport in South Africa, which has been associated with speed-related road fatalities. Although countermeasures have been implemented to address speeding, they have not led to significant reduction in road fatalities and adherence to legal speed limits. Among the countermeasures deployed on some highways is the Average Speed Over Distance (ASOD) system which uses cameras to enforce speed limits. In this paper, historical probe data is used to evaluate the impact of the ASOD system on speed profiles of passenger vehicles. The data also consists of speed, time and location information gathered by navigation and fleet management devices that were installed in minibus taxis. The evaluation is based on spatial differentiation (the impact on the enforcement site with ASOD versus the control site without ASOD) and time differentiation (the impact before and during ASOD enforcement). For passenger vehicles, the results show that the presence of ASOD systems caused a reduction in mean speeds and ensured compliance with speed limits at enforcement and control sites. On the other hand, the system appears to have no influence on minibus taxis, with high, yet similar average speeds measured in the enforcement and control sites during ASOD enforcement.

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