Correctly used Chevron Alignment Markers (CAMs) can reduce run-off-road crashes by 30%.
The use and layout of CAMs is documented in AS 1742.2.
First, identify what the advisory speed is for the curve:
• Determined by measuring the centripetal force exerted on a vehicle through the curve
• Find max travel speed where centripetal force exerted is not too great (‘comfortable’)
• Common tool is the ball bank indicator
• From this information, type of curve warning sign and need for CAMs can be determined
Second, determine the 85th percentile approach speed using survey or experienced judgement.
Third, use Figure 4.6 of AS1742.2 (reproduced here). CAMs should be considered where the comfortable (advisory) speed is at least 15 km/h less than the 85th percentile approach speed.
The use and layout of CAMs is documented in AS 1742.2.
First, identify what the advisory speed is for the curve:
• Determined by measuring the centripetal force exerted on a vehicle through the curve
• Find max travel speed where centripetal force exerted is not too great (‘comfortable’)
• Common tool is the ball bank indicator
• From this information, type of curve warning sign and need for CAMs can be determined
Second, determine the 85th percentile approach speed using survey or experienced judgement.
Third, use Figure 4.6 of AS1742.2 (reproduced here). CAMs should be considered where the comfortable (advisory) speed is at least 15 km/h less than the 85th percentile approach speed.
