How do engineers expand roads to create new lanes without moving the houses/businesses that already exist along the side of the road?

Question

For example, how do engineers create 6+ lanes where there were only 4 before? How are they able to create additional lanes when there are solid structures that exist close to where the old lanes were?

In: Engineering

Answer 1

They don’t. They buy those homes and businesses and bulldoze those buildings to make room for the extra lanes. It’s called eminent domain. The government has the right to buy those buildings at any time and the owners are forced to sell them in order to make room for a Public good.