I thought I'd make a couple of points before posting any comments.
Firstly, I'm not a C&B player, so I have no idea how the game works.
Secondly, I love racing games, so that's why I had an interest in taking a look at this.
Now that that's out of the way, I thought I'd post a few comments.
It looks as though the intent is for vehicles to *not* have damage points per say. In other words, A vehicle can keep functioning as long as a critical hit doesn't do something to take it out of action.
I'm guessing for marked tracks (i.e. using squares or rectangles), safe speeds would be posted wherever the track is staggered for turns. You could also post differing speeds on a lane by lane basis if you want.
Drifting - Instead of just saying that a vehicle must travel "X" number of squares before drifting, you could say that a drift can occur only after 1/3 the speed (rounding up) has been moved. For example, if a player announces that a vehicle is going to move 120mph this turn, with a one lane drift to the left, that drift may occur after 40mph (4 spaces) have been moved through. If a vehicle wishes to drift earlier in its movement than this, then a test must be taken for a severe drift.
You don't mention anything about this, but I'd like to see a non-plotted movement type game if possible. When it's time for a vehicle to move, the owning player simply announces the new speed and moves the vehicle.
More later.
Kevin