There are a fair few roads like this on the eastern end of the Central Line of the London tube network. That bit of line was originally a Great Eastern Railway branch line until being taken over by the tube network around the time of the Second World War and converted to third rail electric in the late 1940s. Of course, that meant the existing level crossings all had to be closed for obvious safety reasons. Some, like the crossing at South Woodford Station, George Lane, South Woodford, E18 were replaced with new bridges and revised road layouts. Others, like Snakes Lanes, Woodford Green and (I think) Eagle Lane, Wanstead, were replaced with pedestrian only subways. All effectively cutting the road in half.