Download Skyway Here.

This is the original design for my Bungie 500 map--a simple banked oval suspended in the air. Several issues with Forge and game variants had to be addressed by altering this design (see the description after the pictures if you care).

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View of the starting area looking down from the access ramp:
http://www.saleagues.com/halo3/main.php?g2_itemId=268&g2_imageViewsIndex=3

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Overhead view of the track.
http://www.saleagues.com/halo3/main.php?g2_itemId=273&g2_imageViewsIndex=3

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View of the transition out of the banked turn.
http://www.saleagues.com/halo3/main.php?g2_itemId=258&g2_imageViewsIndex=3

Issues:

Zero width VIP goal areas don't trigger scoring. I believe that if they did, I could have the goal move on arrival and the player would only receive one point for going through it, regardless of speed.
The minimum time between forced VIP goal area movements is 10 seconds. Lap times on Skyway can be as low as 7 seconds. If the goal area moves right before you go through it, you can go through it again on your next lap and receive no credit for a lap. This lead to players intentionally slowing down to lap times over 10 seconds to score points faster.
0.5 width VIP goal areas can trigger scoring multiple times in one lap (if it is set to move on arrival). From my testing, intentionally slowing down as you drive through the goal area can trigger scoring as many as 7 points.
Having multiple VIP goal areas placed in a "line" can trigger multiple scores. For example, if I had two VIP goal areas in the banked turn:
- On the first lap, you pass over the first (inactive) VIP goal area--no score change.
- On the first lap, you pass over the second (active) VIP goal area--you score a point and the goal area moves to the first goal area. The first goal area is behind your current location on the track, so it will act as the start/finish line on the second lap.
- On the second lap, you pass over the first (active) VIP goal area--you score a point and the goal area moves to the second goal area.
- On the second lap, you pass over the second (active) VIP goal area--you score a point and the goal area moves to the first goal area. You have now received credit for completing three laps instead of two. You can increase the number of VIP goal areas, but the issue will remain. This makes sense, and removes this goal area placement as a possibility.
Placing the VIP goal area at an angle such that only the player's head goes through it can still trigger multiple scores in one lap. Although the area your body passes through is far less than if it were flat on the ground, you can still slow down and receive as many as 3 points in a single lap (my best case scenario).