The pre-collision system in Toyota’s Safety Sense package features autonomous emergency braking (AEB). Using a camera and a radar detector to detect hazards, this system can stop or slow a car without any driver action. Understanding when and how these systems work is important for crash investigators. The affect of target features on the effectiveness of Toyota’s AEB has not been previously published. A car-like target was developed with a changeable radar signature (small and large) and edge contrast (low and high), creating four possible test conditions. A 2017 Toyota Corolla was driven towards the target, in a randomly selected condition, at a speed in the range of 27 to 33 km/h. The vehicle was driven in a straight line under constant throttle. A total of 80 tests were conducted. The AEB system successfully detected the hazard in all the tests, but only stopped the vehicle autonomously in 72 tests. 7 targets with low radar signature and varying degrees of edge contrast were struck. There was no significant difference between the number of low and high contrast target strikes. This study provides insight into the role of edge contrast and radar signature for the detection of hazards in AEB equipped vehicles.