Claims
- 1. A system for communicating to a vehicle operator operating a vehicle upon a roadway in a geographic region in which the roadway is exposed to the sky of the presence nearby of a roadway marker strip on said roadway, comprising:
- MMW radiometer means carried by said vehicle for detecting MMW radiometric energy;
- said MMW radiometer means including antenna means oriented forwardly and downwardly at a steep angle toward said roadway;
- a roadway marker comprising MMW radiometric energy reflecting material, said roadway marker forming a strip adhered to said roadway and essentially flush therewith;
- said roadway marker having a MMW radiometric temperature characteristic distinct from and provides detectable MMW radiometric contrast with the MMW radiometric temperature characteristic of said roadway.
- 2. A roadway marker system comprising a roadway marker on a roadway surface; and a MMW radiometric detector carried by a vehicle for providing MMW radiometric detection of said roadway marker, said MMW radiometric detector including means for sensing MMW radiometric energy emissions and reflections from a small area of roadway surface below said vehicle, said roadway having a first MMW radiometric temperature characteristic and said roadway marker having a second MMW radiometric temperature characteristic distinct from said first MMW radiometric temperature characteristic.
Parent Case Info
This application is a divisional of copending application Ser. No. 08/864,249 filed on May 28, 1997.
US Referenced Citations (13)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0135740 |
Apr 1985 |
EPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
864249 |
May 1997 |
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