There are other workshop levels even harder than this one. The dropper drones are easy to defeat, just go straight to try to put them on one side of the road, then when they get ready to drop, swerve to the other side. The "holes" are meant to be jumped through. Also, only the most obvious path is laden with obstacles. Try exploring the level some more.

This map is ridiculous. I did not like it. The difficulty was in the mass of obstacles that were spread at what seemed like random rather then anything else. I hate the flying obstacles that get speared into the ground and only have holes on the sides as the holes are often too high and cause crashes anyway. The entire tunnel can be cleared from the ceiling just about.