It would be conditionally on-topic according to the situation.
Valid on road driving questions should not be an invitation to basic trivia style questions (Which covered bridges can we drive across in Maine, United States?) or question involving simply numbers (How many trees are there in California you can drive through?) These type of questions, in general, do not add any real quality to our sight and could be an open invitation to some generally watered down questions about The Great Outdoors.
Valid questions about on road driving in The Great Outdoors must refrain from any sightseeing at a distance. In other words sightseeing while driving on any major highway (such as a Freeways, Interstate Highways, Motorways and so on) which in general should be looked at as simply high volume access routes for vehicles. It is just too open a subject for this site. Exceptions to this may arise, but will have to be handled on an individual basis.
Good on road driving questions must limited to a particular area or region and should not include large portions of any country such as the entire state of California and must be limited in someway to the thrill of being outdoors and enjoying nature as in more remote areas and smaller states such as Maine possibly. Road driving questions involving (local) routes that are very remote should be on topic, especially when maps or GPS are unavailable for some reason.
Some examples of possible good on road driving questions:
•What high (above the tree line) mountain roads are publicly accessible in Troms, Norway?
•Are there any good areas near Prince George, BC, where one could get an occasion to enjoy watching mountain sheep while driving to the Yukon?
•Are there any parks where one needs a permit to drive through for sightseeing purposes?
•Do any general driving only sightseeing parks exist near Paris, France?
•What areas in Banff Nation Park are you not permitted to get out of your vehicle due to dangerous wildlife being present (such as bears)? (Not a real question.)
In conclusion, on road driving questions should be on topic, but must not be too general in nature or simply too trivial, even when used as a disability option.