Safe Driving Practices and Defensive Driving
What you must know
Defensive driving is a system, not a mood. The core concepts are following distance, space cushions, scanning, and hazard recognition. The three-second rule is the baseline following distance in good conditions; add one second for each adverse factor such as rain, darkness, or a heavy load, and double or triple it on ice or in fog. At highway speeds, a loaded commercial vehicle needs far more stopping distance than a passenger car, so the space cushion should grow with weight and speed.
Scanning means looking well ahead, checking mirrors on a schedule, and keeping an escape route. Recognize the classic hazards: the vehicle that drifts in your blind spot, the driver who runs a stale yellow, the pedestrian stepping off a curb, and the tailgater behind you. For tailgaters, the answer is to increase your own following distance ahead so you can brake gradually, not to brake-check.
Traps to expect
Exam questions often present a scenario with a tempting but aggressive answer. Passing on a blind curve, speeding up to beat a light, or flashing high beams in frustration are always wrong. Distracted-driving questions reward the answer that removes the distraction entirely. Fatigue questions reward stopping and resting, never rolling down a window or turning up the radio. Right-of-way questions reward yielding even when you technically have priority, because the safe choice is the correct answer on a professional exam.
Worked example: You are following a car at 55 mph in light rain, three seconds behind. The car brakes suddenly. You need more room than three seconds because of the wet surface and your vehicle weight, so the correct adjustment is to drop back to four or five seconds and cover the brake, not to swerve into the adjacent lane without checking mirrors.
Rule of thumb: if you cannot see a safe stopping point ahead, you are following too closely.