Sure. Were they as wide? Do we need 4 lane stroads if most commuters moved to bicycles, public transit or walking?
Mind you there's some cars in the videos, but they aren't any bigger than the horse-drawn carriages that roads had been accommodating well before that.
Road that connects 3 biggest cities in Netherlands has 3 lanes in each direction: https://www.google.com/maps/@52.1822053,4.5947627,3a,75y,47....
Your average road in Netherlands looks like this: https://www.google.com/maps/@52.1968565,4.592548,3a,75y,58.8...
You cannot directly translate between countries with such difference in population density obviously, but if anything - the more people USA has - the bigger gains are there to be realized by switching to more efficient mode of transport.