Results alignment is based on the number of route closures.
The table of acceptable closures provides the annual rate [note 1 below] for each road class when there is a viable alternative route. If there is no viable alternative route [note 2 below] the acceptable number of closures in the table is decreased by a factor of 2.5 (ie for a regional or arterial road the number of acceptable closures becomes 4 instead of 10 closures per year for the two to four hour closure period).
The resilience gap for results alignment is:
o low if all values of the number of road closures are lower than the values shown in the table (adjusted for whether a viable alternative route exists)
o medium if one or two values are greater than or equal to the values shown in the table (adjusted for whether a viable alternative route exists)
o high if three or more values are greater than or equal to the values shown in the table (adjusted for whether a viable alternative route exists).
- Average values are taken over at least a five-year period
- A viable alternative route is defined as:
- unlikely to be affected by the same or related event that disrupts the availability of the original route
- available to all vehicles (including high productivity motor vehicles)
- has the capacity to carry the volume of traffic diverted from the original route
- the additional travel time is no more than two hours.