Feeling in need of a mid-life crisis, I've booked myself on a CBT, with the intention of taking the DAS route to full licence. Did my car test back in 1984 via the mil driving course (full of nice easy tests, like reading the reg plate of a car parked outside the office and a big hint to look at the plate). I've tried the on-line theory tests on the DVLA site; simple enough. But what is this hazard test? The explanation is straightforwards, but what actually is it, and how does it work?