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

I’m seeing this exact thing where I live in California. Been driving through it for the last 10+ years whilst they do a 10 mile section (lol). If you pay attention, they are actually moving the whole freeway left and right while they add lanes. Seems they find a center and go from there.