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Well, you already concluded the solution: As the road is a secondary, the routing engine can assume that the gate is usually open. This kind of guessing should definitely done by applications, not by mappers. It's not part of the job of a mapper to guess when the gate will be closed. The mapper has to map what's on the ground, and that's a lift gate that may be opened or closed at any time, like a light switch that can be switched on and off at any time.