Single Units Trucks (SUT's) are commonly used for hauling many things and typically have a loaded mass between 8,000 to 10,000 kg (18,000 and 23,000 lbs). Concrete barriers are commonly used on high volume traffic highways that have very little median space between opposing traffic lanes. The interaction between SUT's and concrete barriers during impacts at speeds between 80 - 90 km/h (50 - 56 mph) at angles up to 15 degrees is of importance not only to the driver, but also to the surrounding traffic. Of particular concern is the vehicle rolling-over the barrier. This study investigates some recent full-scale crash testing and simulation of SUT's into concrete barriers. Information gained from this study is being used to help determine the next generation of recommended practices and procedures for designing and testing concrete barriers, as well as other types of barriers, like bridge-rails.