[simply Nathan]

I know people in real life who seem to be under the impression that Bicycling should be a prerequisite for Driving(Automobile). I surprised them by never riding a bike and learning to drive anyway.

In GURPS, I've never seen any vehicular skills learned; we used Teamster at default (without even rolling) to guide our loot wagon and one warrior in our party had Riding(Pachycephalasaurus), swinging his halberd around as his dinosaur rammed into his enemies.