Vehicle Carrying Ammunition, Firearms Catches Fire After Colliding With Big Rig On 5 freeway, Prompting SIGAlert A car carrying ammunition and weapons started a brush fire after crashing into a big rig on the 5 freeway, prompting the closure of all southbound 5 Freeway lanes north of Santa Clarita. Around 4:30 p.m. Monday, emergency responders received reports of a crash on the southbound 5 freeway at Templin Highway in Angeles Forest north of Castaic,, which spread into a small brush fire that has been stopped, according to officials on scene. “There was a vehicle engulfed in flames and a small spot brush fire,” said Melanie Flores, a dispatch supervisor with the Los Angeles County Fire Department. “CHP advised that there is ammo and firearms inside the vehicle.”