APPENDIX D CALCULATION OF FIRST YEAR RATE OF RETURN FOR POSSIBLE TREATMENT TO INJURY ACCIDENT PROBLEMS Notes

1. The average cost per casualty (including an allowance for damage only), all hours, is 43,649 and is taken from Table 1 Highways Economic Note 1 November 2004.

2. It has been assumed for the purpose of the FYRR that due to the number of casualties in this investigation being 13 from 13 accidents then if one accident is saved this will result in 1 casualties being saved.

Treatment A1: Introduce Vertical Traffic Calming.

Cost of treatment 60,000

No of casualties saved 2.66 casualties per year (8 over 3 years)

FYRR = (2.66 x 43,649) x 100

60,000 = 193% Treatment A2: Introduction of Formal Crossing facility

Cost of treatment 100,000

No of casualties saved 0.33 casualties per year (1 over 3 years).

FYRR = (0.33 x 43,649) x 100

100,000 = 14% Treatment A3: Introduce Pedestrian Guardrail

Cost of treatment 10,000

No of casualties saved 0.33 accidents per year (1 over 3 years).

FYRR = (0.33 x 43,649) x 100

10,000 = 144%

Treatment A4: Footway Buildouts.

Cost of treatment 30,000

No of casualties saved 0.33 accidents per year (1 out of a total of 6 accidents over 3 years.)

FYRR = (0.33 x 43649) x 100

30,000 = 48% Note. Some of the stated casualty saving percentages have not been used in the FYRR. A site specific assessment has been made to ascertain whether the figures stated would apply. Where it is felt that the stated percentages would not apply then engineering judgement has been used. This method has been applied to treatment A2, A3 and A4.