AI ground units won't drive a long the road

[Gunfreak]

I've made a group of vehicles, the lead is set to a waypoint set to 35kmh, the first waypoint is set to a formation MCU for follow road. and that is set to a mission begin trigger, I've placed waypoints a long the road, making sure their area overlap to the next waypoint

When the mission begins, the lead truck drives to the first waypoint and stops, none of the other vehicles even move.