The CHP continues to investigate last Thursday's tragic collision between a big rig and a bus in Orland. For some reason, a southbound Fed-Ex tractor-trailer crossed over the median of I-5 and crashed head-on into a northbound charter bus carrying teenagers to Humboldt State. The bus and truck were engulfed in a ball of flame. Both drivers were killed, along with 3 adult chaperones and 5 students. Investigators still don’t know why the truck driver, Tim Evans of Elk Grove, lost control of his rig. Thursday, CHP investigators and a Cal-Trans engineer will test vehicles similar to those in the crash to measure braking, visibility, and other characteristics that may have led to the collision. The testing will be done on Eva Drive in Orland, a frontage road that runs parallel to I-5 near the crash scene.