SAN DIEGO - The California Highway Patrol is trying to determine if a two-vehicle crash on Interstate 8 in San Diego on Saturday was a case of road rage.According to the CHP, at about 3:50 p.m., 21-year-old Kelsey Shakespeare was in her silver Volkswagen Jetta and heading west on I-8 just west of College Ave.At the same time, 33-year-old Stephanie Pontarolo was driving her green Toyota Tacoma on the same stretch of freeway, sister-station KGTV reported.The CHP says that the two drivers -- for unknown reasons -- "became engaged in an altercation."Video thanks to San Diego DashCam