We've known you'll be able to drive the Top Gear Test Track in Gran Turismo 5, but this GT5 video indicates it'll be more like a destruction derby because they're keeping the cross-over part of the track intact. Awesome.
When The Stig tests out a car on the Top Gear test track he's alone. The reason for this is that the track is a figure 8 and crosses itself in the middle. If you race more than one car on it, there's the risk that cars will t-bone as they go in each direction. Rather than work around this with a bridge, the designers decided to leave this feature in as an added complication.
Clearly, this will be the best way to determine how good that damage modeling really is.