Thanks for kicking this off, Dom, and for setting up my forum account.
I think defensive driving is the perfect way to start the book and that chapter should probably begin with a message relaying the fact that defensive driving isn't what they teach in drivers ed or those clover school get out of a ticket classes (I believe Eric made a post about those once that pretty accurately sums up what they are about). I think we might also want to include a section on driving with and without all the aids (like anti-lock brakes) that are so common.
I do have one question: what do you mean by What if Game?
Continuing on, now would be a great time for anyone to volunteer to tackle specific sections or to make suggestions. Even if you can't contribute much or if duplicates are made everything will help. Even basic driving advice like "if you have a flat tire in the ghetto, say 'fuck the rim' and keep driving until you get somewhere safe" is useful.
A great deal about driving is common sense, but people (especially impressionable young people) have had, and will keep having, their common sense propagandized out of them in favor of following 'the law' so don't hesitate to cover the obvious.