Construction crews prepare the Davis Avenue bridge for demolition. About 400 Brighton Heights residents will have to leave their homes, move their cars and remove any pets by 11 a.m. Wednesday while contractors use explosives to demolish the unstable bridge.City officials announced Monday that Phoenix, Md.-based Controlled Demolition Inc. will implode the bridge carrying Davis Avenue over Woods Run Avenue between 2 p.m. and 6 p.m. Wednesday. A consultant two weeks ago warned that two deteriorated supports raised the danger of collapse, and Pittsburgh Mayor Luke Ravenstahl called for the emergency demolition.