Re-visiting rotation rates for New Zealand roads

摘要

Research into rate-of-rotation design criteria looked at the effect of different rates on various types of vehicles, from the perspective of both occupant safety and comfort. Rate of rotation, or warp factor, is a measure of the variation in cross-fall of a road surface. This is commonly used in the case of where the road changes from a straight section to a bend, and the road's cross-fall is tilted more in the bend ('superelevation cross-fall') to help keep vehicles on the road.