Wouldn't it be better if the bus' wheels latched on to the actual sides of the road, like say fences/concrete walls on each side of the road? Seems to me like i

Wouldn't it be better if the bus' wheels latched on to the actual sides of the road, like say fences/concrete walls on each side of the road? Seems to me like it would make it less scary for cars to drive under, as they would just have to worry about not hitting the sides of the road like they normally do.