A fiery collision between a pickup truck and passenger car at the Bell Crossing intersection on Highway 93 backed up traffic on the busy road Thursday morning. The result could have been much worse without the quick action of a 17-year-old passerby who probably saved the life of one driver whose car ended up on fire. The wreck — which put both drivers in a Missoula hospital with non-life-threatening injuries — was enough to start the ball rolling on a process that could eventually lead to changes in the way traffic is managed at the dangerous crossing. The wreck happened shortly after 9 a.m. The passenger car was traveling north on Highway 93 when a pickup truck traveling west on Bell Crossing pulled into its path.