David Arquette in Head-On Car Accident

David Arquette was just involved in a head-on collision and he's injured ... TT has learned. David was driving in West Hollywood just a few minutes ago ... when his car veered into oncoming traffic. David is lying on the ground right now -- bleeding --  as fire trucks are racing to the scene. A witness tells our sources ... David was behind a car that stopped suddenly.  David then swerved to the left to avoid hitting the car and went into oncoming traffic.  David slammed into a car going in the opposite direction. David was driving a silver Cadillac. We're told David was on his way to Burbank airport to board a private jet which was going to Las Vegas, for the grand opening of Sugar Factory -- a candy store at the Paris Hotel.  He was supposed to attend a party hosted by Kim Kardashian . Authorities now say the drivers of both vehicles suffered minor to moderate injuries
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