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Steve B.

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Fox_NS_CAN

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The ones on rails and roads are usually "no connection" (ends and is one way with no way out). Or "collapsed" from a disaster. Flooded.
Roads can have "snow covered" in winter.

A screenshot would be helpful, as 28rommel said.
 

ristosal

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If they're caused by tram tracks then the game just notifies you have a track dead-end. I assume something similar would happen if you had conflicting one way directions in your rail network.