How To Turn On Collision?

I'm trying to make a map, but i cant seem to turn on collision for a object from another map. For example, if i import that loop from the grid map, it just is tho orange NO MATERIAL and if i try to drive on it, meh car goes right through. I've tried to put a material on it but that doesn't work either. Thanks!

 

Have you tried closing the map editor after importing it? The collision model won't update until the map editor is closed. Was stuck for about an hour before while messing with maps before I figured that out

 

wow. i never thought it would be that easy. i spent like 3 hours trying to find that out! Thanks! (lol im dumb)