When it first starts
to rain is when roads are the most slippery. The oil and
dust haven't had a chance to wash away, so slow down at
the first sign of precipitation.
During a heavy rain
your windshield can become overloaded with water even when
your wipers are working hard. If you can't see a safe distance
ahead, pull off the road. Try to find a safe place to park,
like a rest area of lot. If the roadside is the only option,
pull over as far as you can, leave your headlights on and
turn on your emergency flashers.