Periodically we hear of 30 car pile-ups, 50 car pile-ups, and even sometimes crashes involving 100 cars or other vehicles.  What causes these?  How could so many vehicles be involved in these accidents?  Each of these situations can cause a chain reaction multi-vehicle accident. FOG Fog is created when warm and cold air combine causing condensation.  It forms during changes in temperature and is often close to the ground. Fog is blinding.  It is impossible to see anything.  It can come up very suddenly on the road.  Drivers may not.

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