A crash involving three vehicles Tuesday afternoon backed up traffic at the corner of Lander and Greenway avenues, just south of Highway 99. According to Highway Patrolman A. Keller, a white car was traveling westbound on Greenway and ran a stop sign for an unknown reason. The car then struck a black Toyota, which was traveling northbound on Lander Avenue.  The Toyota then spun and struck a black pickup truck heading south on Lander. There were no major injuries in the accident.