A vehicle caught fire and the blaze extended to nearby brush on the side of the northbound Interstate 5 south of Calgrove Boulevard around 4:36 p.m. on Sunday, according to a spokesman for the Los Angeles County Fire Department.  Firefighters were dispatched to the fire at 4:38 p.m. and arrived at 4:50 p.m., according to Keith Navarre, spokesman for the Fire Department.