PHYSIOLOGICAL-OPTICAL PROBLEMS OF NIGHT DRIVING

PHYSIOLOGISCH-OPTISCHE PROBLEME DES NAECHTLICHEN STRASSENVERKEHRS

WHILST IN DAYLIGHT CONDITIONS EVERY DRIVER WITH NORMAL EYESIGHT IS CAPABLE OF ASSESING THE TRAFFIC SITUATION AT ONE GLANCE, THE CAPACITY FOR ABSORBING INFORMATION AT NIGHT REDUCES TO A FRACTION OF THE DAYTIME VALUE. THE VISIBILITY OF AN OBJECT DEPENDS ON BRIGHTNESS, CONTRAST, SIZE OF THE OBJECT, THE TIME NECESSARY FOR RECOGNITION AND FINALLY THE CONDITIONS NECESSARY FOR THE EYE TO ADAPT. TAKING IN VISUAL INFORMATION INVOLVES 3 PROCESSES - SEEING, PERCEPTION AND RECOGNITION. NOT EVERYTHING DISPLAYED ON THE RETINA IS TAKEN IN AND NOT EVERYTHING TAKEN IN IS RECOGNISED. HENCE THE MORE INFORMATION IS LOST, THE MORE CONCENTRATION THERE IS ON A DEFINITE PLACE IN THE FIELD OF VISION. ADDITIONALLY THERE ARE OBJECTS IN THE PERIPHERY WHICH ARE EASIER TO RECOGNISE IF MOVING. WEARING SPECTACLES CAN ALSO ACHIEVE A NARROWING DOWN OF THE FIELD OF VISION. NIGHT MYOPIA PRESENTS A FURTHER PROBLEM FOR THE NIGHT DRIVER, SINCE ONE QUARTER OF ALL DRIVERS SUFFER FROM IT. EQUALLY UNPLEASANT IS SENSITIVITY TO DAZZLE, WHICH INCREASES WITH AGE. ALSO THE TIME NECESSARY TO ABSORB VISUAL INFORMATION IS HEAVILY DEPENDENT ON LIGHTNESS AND INCREASES THEREFORE WITH NIGHT DRIVING. DETAILED STUDY IS NECESSARY OF DRIVING AT NIGHT BY SIGHT AS THE LAW DEMANDS, SINCE THE DRIVER UNFORTUNATELY ADJUSTS HIS SPEED TO SUIT THE DISTINCTIVENESS OF BRIGHT OBJECTS AND IN THE CASE OF A DARK OBSTACLE HE IS GUARANTEED NOT TO BE ABLE TO REACT QUICKLY ENOUGH.

Language

  • German

Media Info

  • Pagination: 343-9
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01296634
  • Record Type: Publication
  • Source Agency: Kuratorium für Verkehrssicherheit (KfV)
  • Files: ITRD
  • Created Date: Nov 21 2010 6:00AM