While driving a double and needing to make a quick stop, what braking method should you use?

Answer: B — Controlled or stab braking

The correct method to use when making a quick stop while driving a double is controlled or stab braking. This braking technique is effective for large vehicles, particularly doubles or triples, because it helps prevent the trailer from skidding and maintains better control over the vehicle. When you apply the brakes firmly and quickly but not to the point of locking them up, you perform controlled or stab braking. This involves applying the brakes fully and then releasing them when the vehicle slows down, allowing for a more stable stop. This is particularly important with doubles and triples since these trailers can have a tendency to sway or jackknife if braking is too harsh or abrupt. By using this method, you can stop effectively while minimizing the risks associated with sudden braking, making it the preferred choice when driving long combinations like doubles.