[trhway]

>It also tends to be the case that going faster can reduce the effects of the washboarding (given a reasonable vehicle).

offtopic: reminded about this novel - the reasonable vehicle was a truck with several tonnes of nitroglycerin https://en.wikipedia.org/wiki/The_Wages_of_Fear

ontopic: anyway we'll soon be flying in quad-/octo-copters and the open low-populated spaces like Iowa will be among the most suitable areas for the initial application of those "flying cars".