Most of us are too familiar with the uncomfortable feeling of our car shuddering around us as a semi-truck barrels past on the freeway. Even the largest SUV can feel like a tin can when measured up against an 18-wheeler. Therefore, it's hard to not feel concern when sharing the road with such large and powerful vehicles. Understandably so, as in 2009 alone the U.S. Department of Transportation reported about 124,000 large trucks and buses were involved in crashes. Nearly 50,000 of those crashes involved injuries, and about 3500 were fatal. Knowing the inherent potential for danger, city and state governments have taken steps to make the roads safer for passenger and commercial vehicles alike. The first step, of course, is ensuring that the persons driving these large commercial trucks are competent to be behind the wheel.