Most likely walking.
They asked when was it invented, not who invented it. The first road has been invented by persian (Iranian) and called by The Perisan Royal Road.
John Curr, a Sheffield colliery manager, invented this flanged railroad, though the exact date of this is disputed.
Mr JJ Off-Road invented off road tires
There was no one person that invented the Nation Road
the Romans invented the road
cars invented traffic its simple and road ok have fun
George Pullman invented it
dgdf
in 1820
pekpek
The first national road was The Cumberland road.