The New Jersey Department of Transportation is improving several ramps on the Interstate highway I-80. Calculate the annual benefits (travel time and safety only) of this improvement if the following parameters are provided: – Total AADT entering the interstate: highway
20,000vpd
– Vehicle mix:
85%
cars (assume occupancy of
1.2
persons/veh),
15%
trucks (assume single occupancy); – Average control delay without the improvement: 60 seconds; – Average control delay with the improvement: 40 seconds; – Average annual number of fatal accidents without the improvement:
0.3
; – Average annual number of injury accidents without the improvement: 7.1; – Average annual number of PDO accidents without the improvement: 10.4; – The corresponding AMF is
0.8
for all accidents accident types.
