×

Road traffic weather observation system and self-emission road sign system

  • US 6,812,855 B1
  • Filed: 04/24/2001
  • Issued: 11/02/2004
  • Est. Priority Date: 08/24/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A self-luminous road sign system which comprises a sensor unit for detecting weather conditions, a self-luminous road installation which includes a sign part equipped with an illuminant and, a control part which controls luminous brightness or information display of the sign part based on weather information detected by the sensor unit, wherein the sensor unit is equipped with a visibility meter and an illuminance meter, andthe control part calculates an optimum luminous brightness which provides a predetermined contrast in a driving environment, based on a road background brightness that is previously obtained by the illuminance meter, and the control part controls luminous brightness or information display of the sign part, based on the optimum luminous brightness and depending on visibility information that is outputted from the visibility meter.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×