Road bridges of Chicago have a metal grating instead of solid plate for road. Very innovative detail 1. Allows snow to melt down to the river. 2. Thus decreasing the snow load on the bridge. 3. Thus making it light for opening the bridge vertically like a door to allow large ships to pass through
Good only for well maintained clean cities..
Is that the one by Edward Herbert Bennett?
Farmer ,Entrepreneur (Himalaya Fountains)
5moTunnel effects does make difference..