Table 4 Required accuracy of input...

Table 4

Required accuracy of input variables

Group	Input variable	Range over which the optimal intervention programme does not change: %		Range over which the optimal intervention programmes are similar: %		Range over which the reference intervention programme is near optimal: %
Group	Input variable	From	To	From	To	From	To
A	Condition	−2	+2	0	+1	−6	+2
	Deterioration rate			−1	+4	−37	+24
	Shared cost factor			−9	+19	−50	+57
	Intervention duration			−100	0	−100	0

B	Probability of failure	−31	0	−37	0	−47	+103
	Corrective intervention	−100	+11	−100	+11	−100	+1163
	Intervention costs	−21	+130	−21	+134	−91	+63 397
	Discount rate	−15	+282	−15	+325	−100	+1330

C	Passenger volume	−60	+35	−60	+35	−100	+1100
	Accident probability
	Fatality probability
	Fatality cost

D	Additional travel time	−100	+250	−100	+250	−100	+9000
	Value of time
	Injury probability
	Injury cost

E	Reaction time	−100	+1286	−100	+1286	−100	+31 822
E	Property damage	−100	+3261	−100	+3261	−100	+207 412

Group	Input variable	Range over which the optimal intervention programme does not change: %		Range over which the optimal intervention programmes are similar: %		Range over which the reference intervention programme is near optimal: %
Group	Input variable	From	To	From	To	From	To
A	Condition	−2	+2	0	+1	−6	+2
	Deterioration rate			−1	+4	−37	+24
	Shared cost factor			−9	+19	−50	+57
	Intervention duration			−100	0	−100	0

B	Probability of failure	−31	0	−37	0	−47	+103
	Corrective intervention	−100	+11	−100	+11	−100	+1163
	Intervention costs	−21	+130	−21	+134	−91	+63 397
	Discount rate	−15	+282	−15	+325	−100	+1330

C	Passenger volume	−60	+35	−60	+35	−100	+1100
	Accident probability
	Fatality probability
	Fatality cost

D	Additional travel time	−100	+250	−100	+250	−100	+9000
	Value of time
	Injury probability
	Injury cost

E	Reaction time	−100	+1286	−100	+1286	−100	+31 822
E	Property damage	−100	+3261	−100	+3261	−100	+207 412

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