Road traffic weather observation system and self-emission road sign system
First Claim
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.
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Accused Products
Abstract
A self-luminous road sign system comprises a plurality of sensor units 1 . . . 1 each of which is equipped at least with a visibility meter and an illuminance meter, or which may be equipped with an anemovane and a thermometer as well as the visibility meter and the illuminance meter; and an information processing and management department 2 for centralized management of weather information detected by the plural sensor units in order to predict any danger in the road observation area, wherein the output information from the information processing and management department 2 is displayed on road installations 4 . . . 4 connected via a network. Based on the road background brightness obtained by the illuminance meter in the sensor unit, the optimum luminous brightness which provides a predetermined contrast is calculated. Based on this optimum luminous brightness and depending on the visibility information outputted from the visibility meter, the luminous brightness or information display of the sign part is controlled.
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Citations
16 Claims
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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, and
the 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.
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16. A self-luminous road sign system which comprises a sensor unit for detecting weather conditions including visibility, a self-luminous road installation which includes a sign part equipped with an illuminant and, a control part which controls luminous brightness of the sign part based on the visibility detected by the sensor unit, wherein the sensor unit senses meteorological optical range and ambient illuminance and the control part automatically controls the self-luminous road installation to provide a suitable contrast to a human'"'"'s eyes depending upon the visibility.
Specification