The roadway and track need a bit more distance between each over - getting the occasional running glitch when a road vehicle and train are in close proximity, they want to meet each other.

Something that was not an issue with large ( std set track pieces) as the roadway could be moved more towards the middle. May try a bit of screening on the roadway control box as I suspect this could also be part of the problem or re-routing some of the wires.
Fortunately this problem has been spotted before the road was fixed down and blended in with the scenery.