For full details on the design challenge, read the blog post: http://www.reachingperfection.com/2011/12/design-challenge-racing-towards.html
Use this thread for posting questions, works in progress, and giving/getting feedback. The final submission thread will be available during Testing Week (January 1st - January 8th) and you can edit your submission at any time up to the January 8th deadline. Until the deadline I highly suggest you use this community to your advantage and constantly post updates to your map to receive as much feedback as possible.
Remember you are designing these race maps to work in a matchmaking scenario...
USE THIS COMMUNITY TO YOUR ADVANTAGE!!!
I cannot stress enough how important it is to the design process to get criticism and use it to improve your map multiple times over. Anyone can build a map, but only a real designer can perfect it.
: I just started a thread on what makes a good race map in the Game Design Discussion forum. Check it out folks: http://forum.reachingperfection.com/What-makes-a-good-Race-map-td3570942.html