As a travel power group, I can see vehicles being used, but in a very restricted manner.... they could appear just like some toons do on mission maps... they come (or go) a certain distance and fade into (or fade out of) existance. You enter (or exit) a vehicle just like entering a mission, the door opens and you jump in, (jump out). To make it feasible it would: 1) be an outside power only, 2) take you from your current position to active mission door location, 3) you could not do anything while being transported. In effect, it would be like TPing there, but safer (can't hurt others or be hurt while in the vehicle). If there needs to be a trade off, (travel without risk of injury for something) then perhaps a high end usage or make it slower than the faster travel powers... (but safer - useful for the lower levels....) I would not make the vehicle something that you could drive yourself, it would be assumed you would be going to a very specific location. You could even have it work that once activated it pops up with a menu (like train stations or the ferry) with specific locations, like train station, ferry, wentworths, arena. To minimize the graphics, use a standard car, but to indicate its a "power pool" car, maybe it has the character logo on hood and is color matched to current costume.