I WAS TRAVELING ON 91 NORTH, EXIT 14 IN WEST SPRINGFIELD, MA ON THE ROAD THAT LEAD TO THE MASS TURNPIKE. THERE WAS HEAVY TRAFFIC DUE TO IMPENDING SNOWSTORM THE NEXT DAY AND THANKSGIVING. A CAR IN THE LANE NEXT TO ME SLOWED AND PUT HIS RIGHT DIRECTIONAL ON. I SLOWED TO ALLOW HIM INTO MY LANE. HE THEN CHANGED HIS MIND, CANCELED HIS DIRECTIONAL AND PROCEEDED ON TOWARD RT. 5. FOR AN INSTANT, I GLANCED DOWN AT MY LAP AND WHEN I LOOKED UP THE ROW OF CARS IN FRONT OF ME CAME TO A COMPLETE STOP AND I CRASHED INTO THE CAR IN FRONT OF ME. THE PASSENGER AIR BAG WAS DEPLOYED BUT NOT THE DRIVER'S BAG. I HAD NO PASSENGERS IN MY CAR. *TR