To flesh out the toll history of the Turnpike, the original system was cards with very few exits. Charleston North (current Exit 96) Charleston South (Exit 95), Chelyan (Exit 85), Mossy (Exit 66, then a one way exit, on towards Charleston, off from it), Beckley (current Exit 44) and Princeton (Exit 9).
Mossy was originally for the use of a governor from Oak Hill, as the governor's residence in Charleston was renovated during his term and he commuted. After he left office they just let anybody use it. Although it was a two lane road and you could turn around and go the other way if you wanted, the toll card had confiscatory rates for entering there and exiting south of there.
Later, as the road was finally upgraded, the current north and south toll booths took the tickets, with ramp tolls north and south of there. Then when the whole thing was finally finished, they went to the "open" system with more exits and ramp tolls.
Then when the road was really paid off (1987) as a part of the deal to extend the tolls the legislature made them take the ramp tolls off, except for the Corridor L one.