Authors present a synthesis of data concerning the relationship between HIC values and head injury levels, obtained from various methods and under several particular test conditions. Then, frontal collisions are discussed. Two cases are separately considered: when head impacts occur, and without head or neck impacts. Accidentological data allow one to conclude that no criterion is presently needed when no head impact is recorded. On the contrary, when head impacts are undergone, biomechanical data and analyses of kinematics are in favour of HIC 1500 as far as 3-point belt is used.
The other classical types of accidents are mostly relevant to the case of direct head impacts; HIC 1500 criterion may apply provided that a sufficient pressure distribution exists—besides, the protection of the face is a particular problem.