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Appendix 3.3
(s. 3.5.8)

Safety Planning Distances

Speed km/h Safety planning distance (metres)

100

300

80

210

70

170

60

135

50

105

40

75

Notes.

  1. The above distances are the minimum distance within which a vehicle travelling at or near the speed listed could be safely be brought to a controlled stop. The distances are based on a 0.3 skid resistance factor, a 3 seconds perception/reaction time, vehicles travelling between 100% and 130% of the speed listed and medium braking of an approaching vehicle.
     
  2. It is assumed that the approaching vehicle is travelling on a dry bitumen surface.
     
  3. As the stopping distance of a vehicle is increased during wet conditions the stated distances may increase significantly to the point whereby it would be unsafe to operate under such conditions.
     
  4. Should a driver have a delayed reaction to the presence of a static interception site the distance required to stop may well increase significantly.
     
  5. During the hours of darkness most vehicle headlights will not provide sufficient lighting to allow a driver to perceive a hazard in excess of 150 metres in an unlit area. The driver's perception/reaction time will also be increased which will lengthen the stopping distance required.

 

Issue 6 - October 2003

Last Updated: 01/07/2009