Descriptor	Consequence	Insignificant	Minor	Moderate	Major	Critical
Probability	Description	Minor delays during clean-up and/or insignificant risk to users	Reduced capacity and/or low risk to users	Reduced to half the capacity for more than 24 hours and/or unacceptable risk to users	Route closed for more than 24 hours and/or major risk to users	Sever the route and/or extreme risk to users
Almost Certain	Expected to occur in most circumstances	High	High	Extreme	Extreme	Extreme
Likely	Will probably occur in most circumstances	Low	High	High	Extreme	Extreme
Possible	Might occur at sometime	Negilible	Low	High	Extreme	Extreme
Unlikely	Could occur at sometime	Negilible	Negilible	Low	High	Extreme

Planning programme and funding manual

Chapter F8 Renewal of roads