So I was playing yesterday with some friends and we came to discuss how to calculate the longest route if double paths are used. Let's say I have a route going Brest -> Dieppe -> London -> Edinburgh -> London -> Amsterdam -> Essen -> Berlin. On the London -> Edinburgh -> London part I have used both paths. Am I allowed to use this part of the route when calculating the longest route?`
You are not allowed to use both parts of a double route.