Failure Consequence
Probability of hazard
Degree of instability: area affected and rate of movement.
Danger to life or disruption of traffic if road fails.No instability. Low, e.g. low probability of instability, small area affected and slow movement. High, e.g. high probability of instability, large area affected and rapid movement.
Low, e.g. agricultural land and low traffic.0 1 2
High, e.g. urban land and high traffic.0 2 3