While spending an inordinate amount of time on the NJ Turnpike yesterday, I began to wonder about the mileage markers. I can understand putting them every tenth of a mile, but why does every bridge over the turnpike need to be marked, down to the hundreth of a mile?
Maybe for repairs. Some turnpike guy drives along making a note of stuff that needs attention, and hundredth-mile markers let him be accurate in his notations.
My WAG same as chriszarate’s.
Note that sometimes, instead of making one wide overpass, they make two narrower ones. The marker might be used to distinguish them.
Accurate clocking of vehicle speed…a la VASCAR. ???
(Police can use bridges/underpasses as good reference for clocking vehicle speeds)
I dunno about NJ, but in CA, the milemarkers have decimal miles to mark something: a culvert, a pullbox, beginning or ending of the CL curve…
Out here, bridges also have identifying NUMBERS as well, prefaced by the year built.
~VOW