Adverse driving conditions: Be prepared, be safe
A professional driver should always be ready for extreme weather. Rain, fog, snow, and ice can be at the least, inconvenient, and at worst, deadly. Being prepared, including driving defensively, can make the difference when it comes to safe travel.
Rain
Rain can have an adverse impact on vehicle control as well as driver visibility.
When rain first starts to fall, it mixes with the dirt, oil, and grease that cover the road’s surface. Until additional rain breaks down and washes away this oily mixture, the pavement is slick. This condition can last anywhere from a few minutes to a few hours.
A heavy rain that causes water to stand on the roadway can cause a vehicle to hydroplane. This is because traction is only present when a vehicle’s tires have contact with the road. If the tires are riding on a wall of water, they lose traction. This loss of traction causes a loss of steering control. The best way to prevent hydroplaning is by slowing down, as the faster a vehicle travels, the greater the chance of hydroplaning.
When traveling in rain:
- Reduce vehicle speed;
- Increase following distance and allow for more time to stop; and
- Use the vehicle’s headlights, windshield wipers, and defroster.
Fog
Poor visibility is the challenge when driving in foggy conditions. Reducing vehicle speed and maintaining a safe following distance are key.
When driving in fog:
- Low beam headlights must be used to help the driver see the roadway and to be seen by other drivers.
- High beam headlights should never be used. In foggy conditions, the water particles that make up fog tend to reflect more light back at the driver than on the roadway. This reduces the driver’s ability to see the roadway.
Windshield wipers should be used to clear the fine mist that accumulates on the windshield.
Snow
Falling snow can reduce visibility, and the addition of wind can cause even greater visibility problems. As well as making it harder to see the road, wind-blown snow can obscure signs, road markings, and off ramps.
Common sense and professional judgment of road conditions should dictate appropriate speed and following distance. The same factors will help in making a safe decision on whether to continue driving as road conditions and visibility deteriorate.
Snow causes reduced traction and limited visibility. For visibility and vehicle control purposes:
- Reduce vehicle speeds by at least one-half,
- Increase following distance,
- Accelerate slowly and smoothly, and
- Steer and brake with care.
The use of low beam headlights can increase visibility. High beam headlights must not be used in these conditions, as they reduce visibility.
Ice
An icy road can present even more dangers than a snowy road. A drop in temperature can have an impact on vehicle traction.
One of the most dangerous results of temperature change is the formation of black ice on the road.
Black ice forms when temperatures drop rapidly and any moisture on the road freezes into a smooth, nearly invisible, slippery surface.
Bridges and overpasses can also be dangerous when conditions are right for ice to form. Ice forms first on bridges and overpasses because air can circulate both above and below the surface of the bridge or overpass. This causes the temperature to drop more rapidly than on a normal road.
Braking distance is also a concern when traveling in icy conditions. Depending on temperature and road conditions, braking distance can increase four to ten times that on a dry road.
Key to remember: When operating in adverse conditions use extreme caution. Slow down, increase following distance, and turn on the vehicle’s headlights.