If, during the test, there is contact between the head and any vehicle component, a calculation of HPC is made, on the basis of the acceleration (a), measured according to paragraph 5.2.1 of annex 3, by the following expression:
Kui pea puutub katse käigus kokku mõne sõidukiosaga, arvutatakse HPC 3. lisa punkti 5.2.1 kohaselt mõõdetud kiirenduse (a) põhjal järgmise valemi abil: