How should I drive safely in fog?

Treat fog as a visibility decision, not as normal rain. Around Grantville, Hershey, I-81, I-78, and PA Turnpike approaches, a familiar road can feel different once fog cuts down what you can see ahead.

The Federal Highway Administration describes fog as a low-visibility condition that can appear suddenly and worsen quickly. Its guidance is to slow before entering fog instead of waiting until you are already inside the thickest part (FHWA Road Weather Management, FHWA Driver Safety Issues).

If visibility is already too poor, the best choice is to avoid the trip when possible. If you are already on the road, look for a safer off-road place, such as a rest area or truck stop, and wait for conditions to improve rather than trying to force the drive.

Fog is not only about whether you can see the centerline. It also affects whether other drivers can see you, how quickly traffic ahead slows, and how much room you have to react.

FHWA explains that low visibility can create larger differences in vehicle speeds, and those speed differences increase crash risk. FHWA also reports that fog is associated with more than 38,700 crashes, more than 600 deaths, and more than 16,300 injuries each year (FHWA Road Weather Management).

In plain English: one driver may slow way down while another driver enters the same fog bank too fast. That mismatch is part of what makes fog driving safety different from a normal clear-morning commute.

For headlights in fog, FHWA advises using low-beam headlights and fog lights, if the vehicle is equipped with them, even during daytime (FHWA Driver Safety Issues). The goal is simple: help you see what is close enough to matter and help other drivers notice your vehicle sooner.

Before a low-visibility morning drive, a quick outside check can catch obvious problems:

• Low-beam headlights turn on.
• Brake lights work when the pedal is pressed.
• Turn signals flash front and rear.
• Hazard lights work.
• Wipers clear the windshield instead of smearing it.

If lights flicker, work only sometimes, stay dim, or warning messages appear, that is not just an inconvenience in fog. It is a visibility-related electrical concern that should be diagnosed professionally.

Sometimes there is no safer place to stop right away. In that situation, FHWA guidance is to obey fog-related warning signs, slow down, leave enough stopping and sight distance, avoid passing, watch for vehicles that may be on the roadside, use highway reflectors to read curves, and listen for traffic you may not be able to see (FHWA Driver Safety Issues).

At the wheel, that looks like this:

• Ease off the accelerator before the fog bank, not inside it.
• Leave more space than you would on a clear road.
• Stay in your lane and avoid passing.
• Watch reflectors, lane markings, and the road edge without staring at one spot.
• Keep noise inside the vehicle low enough that you can hear nearby traffic.

If the vehicle starts pulling, shaking, braking poorly, or showing a warning light while visibility is limited, get to a safer place as soon as you can. If the vehicle feels unsafe, do not continue driving.

Getting off the road is not the same as stopping on the shoulder.

FHWA says if fog conditions are too poor, drivers should leave the roadway at a safer off-road location such as a rest area or truck stop and wait. It also does not recommend parking on the shoulder in fog because other drivers may have trouble seeing a stopped vehicle (FHWA Driver Safety Issues).

That matters on interstate shoulders, ramps, and darker rural roads around Central PA. If you cannot reach a safer off-road location and the roadside location is unsafe, stay away from traffic and call roadside assistance or emergency services.

Good maintenance cannot make fog disappear. It can, however, reduce avoidable visibility and control problems before the weather adds pressure.

For foggy Central PA mornings, pay attention to:

• Headlights, fog lights if equipped, brake lights, signals, and hazards.
• Wipers and washer operation.
• Tires with no obvious damage or severe wear concerns.
• Brakes that feel normal and do not make warning noises.
• Steering that tracks normally without unusual looseness, pulling, or vibration.

NextGen AutoWorks can help with electrical diagnostics for lighting concerns, plus routine maintenance, tire services, and brake repair when those systems need attention before low-visibility driving.