Massive development near me planned. Should I sell before or after?

There are currently three huge developments near us that have now entered the planning phase. Our town decided to eminent domain businesses to hand them on a nice plate to a developer looking to build some 3000 units which will turn our normally busy traffic to a nightmare.

We've been thinking about moving for a while but I'm curious if we should move before the developments go up or do prices typically go up after a massive unit complex is built nearby?