RAINBOW (CNS) - Authorities today were searching for a motorist who fled from a two-vehicle crash near a Rainbow intersection, leaving the other driver severely injured and trapped in his vehicle.The crash was reported around 7:30 a.m. in the 1900 block of Rainbow Valley Boulevard, east of Interstate 15, according to a California Highway Patrol incident log.Firefighters responded to the scene and had to take the door off of one of the vehicles to rescue its driver, a man whose age was not immediately available, said North County Fire Protection spokesman John Choi.The victim was taken to Palomar Hospital for treatment of life-threatening injuries, Choi said.The driver of the other vehicle, described only as a tan Honda, fled the scene by the time authorities arrived, the CH
