The evaluation of the head injury criterion (HIC) assessing injuries of a pedestrian when hit by a vehicle, if simply defined, provides no practical hint for designing a bonnet structure with good safety performance. We have studied relations between the time history of the impact, HIC performance and bonnet structure; based on that, we established a method how to define, visualize and remove shortcomings of an existing bonnet design. The abilities of the approach are demonstrated on the results of practical application. and Obsahuje seznam literatury