Hello,
The cars in demo crossing the junction in straight line because they follow the splines, which are straight. If you would put in your level splines that turn at the junction then the car will turn, following the spline assigned to this car. In your blueprint you will need to reassign the car to another spline so the car will be able to change the route (change the spline to follow). Our system based on splines, no on the targets, that’s the difference.
Hope this answer your question.
Regards,