I just tested this too and I found a fix. In newer versions of UE4 you can’t modify a static mesh’s collision after it’s been spawned (as it was done in this blueprint), but you can just set it in the “AddRoadToSpline” function (It’s in the functions list of the RapidRoadTool blueprint), click on the “Add Spline Mesh Component” and collisions options should pop up on the right. Set “Collision Presets” to “BlockAll” or whatever you like and it should work.