Effects of central hatching: An analysis on vehicle speed, vehicle lateral placement & overtaking maneuvers

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Status of Project : Ongoing in 2010 - initiated in April 2009

Research Officer: Alvin Poi Wai Hoong, Nusayba Megat Johari

This study involves determining the effectiveness of central hatching with regard to speed reduction and improvement in lane discipline on a 4-lane rural road in Malaysia. This study employed a before and after approach to determine if there are significant changes to both the parameters on both periods. The results showed the implementation of central hatching has been effective in reducing vehicle speed as well as lane discipline. The average travel speed of vehicles was found to have significantly reduced by 3 km/h for the after period. A significant reduction in lateral position of vehicles with reference to the median edge line (centerline or central hatching) for the after period suggested that vehicles on the nearside lane travelled closer to the median compared to the before period. It somehow indicates that drivers feel safer staying in their lane to avoid getting into conflict with the opposing vehicles. The findings will provide the road authority with an alternative to physical median when considering road improvement programs on single carriageway road.

Project output :
1. The iRAP Programme: The safety effect of central hatching, conference paper presented at the 13th REAAA Conference 2009, Incheon, Korea.
2. The safety effects of central hatching on four-lane rural road in Malaysia, proceedings at ROSCON 2010, Kuala Lumpur, Malaysia.