AI Traffic not driving on roads

Hi,
So I just tried the AI traffic in free driving mode in beamng. Everything was good, until now. I install a map from the mod manager, the map is called east cost rework, there is another map which is also called like this but it's an already existing map, only reworked, mine is completely new. When I spawn AI traffic on this map, the traffic spawns but after about one minute I hear tires squeal on the streets and I see that several cars are just not properly driving on the roads, for example they turn right too early and crash into a later, but then they don't reverse and make it right, they reverse and then they crash into the latern again. And then, they just keep going stepping on the gas but they are stills stuck into the latern, but they try to continue as if there were nothing. Does anyone know why this is? In other maps the traffic is good.
Thank you guys!