Solved AI on bridges?

If you ask this it's because you use decals roads which create automatically waypoint for ai

In the map editor you can add waypoint manually, give them names.
Create a map.json in the same folder as the .mis with this

Code:

{
    "routes" : {
        "simpleLoop" : {
            "segments" : ["s1", "s2"],
            "loop": true
        }
    },
    "segments" : {
    //parking
        "s1" : {
            "nodes" : ["w_park_t33", "w_park_t34"],
            "drivability" : 1
        },
        "s2" : {
            "nodes" : ["w_park_t35","w_park_a100","w_park_a101", "w_park_a102"],
            "drivability" : 1
        }
    }
}

in nodes you put the waypoint names you just created