1.3 Adverse Conditions and Night Driving

Driving at Night

Night driving is harder because you can see only as far as your headlights reach, depth perception and color vision fade, and oncoming glare strains your eyes. Washington law (RCW 46.37.020) requires headlights from a half-hour after sunset to a half-hour before sunrise, and any time visibility is poor enough that you cannot clearly see people and vehicles 1,000 feet ahead — that includes fog, heavy rain, and dusk. Turn on your headlights, not just your daytime running lights, so others can see you from both front and rear.

High-Beam Etiquette

High beams let you see farther on dark open roads, but they blind other drivers if misused. Washington's RCW 46.37.230 sets two clear distances:

• Dim to low beams within 500 feet of an oncoming vehicle.
• Dim to low beams within 300 feet when following another vehicle, so your beams do not glare in their mirrors.

Use low beams in fog, rain, and snow — high beams reflect off the water droplets and create a wall of glare that makes seeing worse, not better. If an oncoming driver fails to dim their high beams, look toward the right edge of your lane to avoid being blinded, and use the white fog/edge line as a guide rather than staring into the lights.

Don't Overdrive Your Headlights

You are overdriving your headlights when you drive so fast that you cannot stop within the distance your headlights light up. That creates a blind collision area in front of the car: a hazard inside the dark zone appears with no time to stop. The fix is simple — slow down at night so your total stopping distance fits within the lighted distance ahead. Keep your windshield and headlights clean, since dirt cuts how far you can see and be seen.

Rain and Wet Roads

Rain reduces traction and visibility at the same time. The pavement is most slippery during the first 15 minutes of rain, when water lifts accumulated oil, grease, and dust to the surface before the rain washes it away. Slow down, turn on your low-beam headlights, increase your following gap, and avoid sudden steering or braking.

Hydroplaning

Hydroplaning happens when a film of water builds between your tires and the road, so the tires ride on the water instead of gripping the pavement and you lose steering and braking control. It is more likely at higher speeds, in standing water, and with worn or under-inflated tires. To prevent it, slow down in rain, keep good tread depth, and avoid puddles and standing water. If you feel the car start to hydroplane:

1. Ease your foot off the gas gradually — do not stomp the brake.
2. Hold the wheel straight and do not make sudden steering moves.
3. Wait for the tires to regain contact, then brake gently if you still need to slow.

Snow, Ice, and Skid Recovery

Snow and ice cut traction dramatically. Bridges, overpasses, and shaded spots freeze first because cold air circulates above and below them, so they can be icy when the rest of the road is merely wet. Black ice — a thin, clear sheet — is nearly invisible; suspect it near 32°F, on shaded curves, and in early morning. Slow down well before turns and stops, brake gently and early, and leave a much larger following gap.

When required in mountain passes, carry tire chains or use approved traction tires, and install them before conditions get bad rather than on an icy shoulder. Watch for posted chain-requirement signs on Washington passes.

Recovering From a Skid

A skid happens when the tires lose grip — usually from braking too hard, accelerating too hard, or turning too sharply for the surface. The correct recovery is the same idea every time:

1. Ease off the accelerator (and the brake) — do not slam either.
2. Do not lock the brakes; in a car without anti-lock brakes, pumping gently is better than a hard stomp.
3. Steer in the direction you want the front of the car to go — this is "steering into the skid." If the rear slides right, steer right.
4. As the car straightens, gently straighten the wheel so you do not over-correct into a skid the other way.

Fog and Reduced Visibility

In fog, use low beams (and fog lights if equipped), slow down, and increase your following distance. If fog becomes too thick to see safely, pull completely off the road, turn on your hazard flashers, and wait for it to lift. Do not stop in a travel lane.

Sun Glare and Vehicle Failures

Sun glare at sunrise and sunset can blind you briefly — use your sun visor and sunglasses, keep the windshield clean inside and out, and slow down. Be alert for vehicle problems too: if your headlights fail at night, slow down and pull off the road; if your wipers fail in rain, slow down and exit at the first safe opportunity. Knowing the right response to reduced visibility and minor vehicle failures is regularly tested on the Washington knowledge exam.

Worked Example: You are driving at night on a rural two-lane highway with your high beams on. A car appears ahead coming toward you, about 450 feet away. Washington's RCW 46.37.230 says you must dim to low beams within 500 feet of an oncoming vehicle, so you switch to low beams now. As you pass, the other driver leaves their high beams on and blinds you — so you look toward the right edge line of your lane until the car is past, rather than into the glare, keeping your speed down so your stopping distance stays within what you can see.

Conditions and the Right Action

Use this table to lock in the correct response to each common condition tested on the exam.