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it happened again
maybe something to do with building barriers while a truck is already traveling?
yeah thats whats causing it
when a truck is already on the bridge and you extend the barriers, it pulls off THROUGH them to one of the 2 sides seemingy at random. When it goes off the water side it falls down the cliff
3rd time, it went through the barriers on the opposite side and stopped moving while recalculating its route
Whenever this happens, we'd appreciate a save from before this happens so that we can catch the truck red-handed, hoping that simulating from that save forwards would trigger it again
it's reproduceable and is caused by player actions
just extend the barriers while a truck is driving across the bridge and it happens again
Found a reliable repro, load the save and paste this blueprint like the image and the 2nd truck passing over the bridge should be bugged. (you have to delete some walls to paste the BP) b557
B596: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

I've got a save i can upload later with a replicable fault that seems to mirror this issue.
The behaviour seems to be caused by having a valid bridge route for trucks enroute to a job, then doing something to invalidate the bridge route. In my case i turned the road section to blank. Trucks would continue to approach the bridge until realising it was 'closed' and take off down a hill into the water. They can be focus tracked until (i assume) they go too deep and focus is lost.
In Matt's screenshot above you can see where bridge access has been reduced to 2 tiles thus creating the same result as me