Truck trips is a more useful measure of traffic that a Marcellus well would generate:

From chapter 6 of the SGEIS (section 11) DEC estimates the number of truck trips required for a multi-well pad in the Marcellus Shale

Drill pad & road construction equipment 10 – 45 trucks

Drilling rig 60 trucks
Drilling fluid & materials 200 – 400 trucks
Drilling equipment (casing, etc) 200 – 400 trucks
Completion rig 30 trucks
Completion fluids & materials 80 – 160 trucks
Completion equipment (pipe, wellhead) 10 trucks
Hydraulic fracture equipment 300 – 400 trucks
Hydraulic fracture water 3200 – 4800 tankers
Hydraulic fracture sand 160 – 200 trucks
Flowback water removal 1600 – 2400 tankers