Article
EXTENT OF SIGHT DISTANCE REDUCTIONS CAUSED BY RAINFALL ON SINGLE CARRIAGEWAY ROADS
DOI: 10.7708/ijtte.2013.3(3).06
3 / 3 / 291-301 Pages
Author(s)
Johnnie Ben-Edigbe - Department of Geotechnics and Transportation, Universiti Teknologi, Malaysia -
Abstract
The paper is aimed at probing the extent of sight distance reductions along a single carriageway road caused rainy conditions. Stopping and passing sight distances were investigated under dry weather, light, moderate and heavy rainy condition. Rainfall intensities being; light < 2.5 mm/h, moderate 2.5-10 mm/h and heavy 10-50 mm/h were based on Malaysian meteorology classification system. Based on the hypothesis that rainfall irrespective of intensity has significant effect on roadway visibility and by extension sight distance reductions, impact studies were carried out at two locations at Terengganu, Malaysia. Continuous traffic volume, speed, vehicle types and headway data were collected for 8 weeks, collated and analysed. Results show about 17% reduction in average stopping and passing sight distances due to rainfall. The paper concluded that irrespective of their intensities rainfalls have significant impact on sight distances.
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Acknowledgements:
The authors wish to acknowledge with thanks the Dungun Traffic Police and Public Work Department for ensuring safety of crews during the installation of data collection equipment, Department of Irrigation and Drainage of Malaysia for providing the rainfall data and also Road Safety Research Group of Universiti Teknologi Malaysia.
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