Table 3.

Target ranges for structures, pedestrians, and vehicles. Vehicular, pedestrian, and structural targets are categorized by their frequency or monetary value. For example, the probability of a vehicle or pedestrian occupying a target area in target range 4 is between the lower and upper limits of 1/10,000 and 1/500. Using the value of a “hypothetical life” of £1,000,000 the structure value within the target range 4 is £101–2,000.

Target rangeStructure (repair value)*Pedestrian frequencyVehicular frequencyProbability ratioz
1(a) Very high value
(b) Habitable
> 36 per hour–constant(a) Motorway
(b) Trunk road, built-up and non-built-up areas
(c) Principal road, built-up area
2High value10–36 per hourPrincipal roads, non-built up-area1/20
3Moderate–high value1–9 per hourMinor roads, moderate use or poor visibility1/100
4Moderate value< 1 per hourMinor roads, low use and good visibility1/500
5Low value≤ 1 per dayMinor private roads and tracks (no data available)1/10,000
6Very low value≤ 1 per weekNone1/120,000
  • * Structure values represent the likely cost of repair or replacement. Very high = £50,001–1,000,000; high = £10,001–50,000; moderate–high = £2,001–10,000; moderate = £101–2000; low = £11–100: very low = ≤£10.