Sounds Like an interesting Idea. I'll try to make a video.
I solely use buildbox 3 but I believe the same or a similar node exists in buildbox classic. Using the search bar inside of your object, or where...
I think I've found/made what you're looking for...
See if you can convert the model From what ever format it is originally to the OBJ or FBX file extension. I have use used at least one sketch fab...
Try send and receive nodes. When one one car collides with other send a signal to a move node inside the car you want to stop moving. If that node...
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