Accident signals especially for motorists

摘要

The accident signals (1-4) correspond with human intuitive recognisable signals. At the accident location, preferably the signal will open. The first signal (1) shows that no help is needed. The second (2) indicates that help is urgently required. The third signal (3) alerts passer-by that help has already been requested. The fourth (4) tells others that there is a hazard or danger at the accident.