boldtrn
No this is wrong. Most gates, especially on bigger roads follow rules. For example think about the "Wintersperre", there are a lot of these gates on secondary roads. Most of them are either tagged with access conditional or mappers change the tags according to the current situation. Probably this lift gate has it's own rules as well, they should be reflected by the node and not implied by the routing engine. I would be surprised if this gate might change it's state  randomly, but probably there is a sign next to the gate explaining when it's open and when it's closed.