On Lemsford Road in Hatfield there is a very obvious dip in the road. It’s not just to collect rainwater (although it is very good at that) – it takes the road under the route of the Hatfield – St Albans railway line, now mostly converted to a cycle path and with very few clues left!
Below map is from the excellent RailMapOnline – click it to look at more historic railway lines!
Road Oddities 
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