Questione giuridica chiave
Whether the 27 June 1999 braking/headrest incident qualified as an accident under compulsory accident insurance law.
Decisione estratta
The incident did not meet the legal definition of an accident because the claimed headrest impact was not an unusual external factor and the sudden motion itself was an ordinary braking event.
Motivazione estratta
A sudden braking without collision is not enough; the alleged forward/backward movement and contact with the headrest are not unusual in such situations, and the HWS symptoms would in any event stem from the motion before any impact.