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| Number | Title | Issue Date |
| 4311876 | Route guidance system for roadway vehicles A central station of a route guidance system collects traffic data from various points of a city area and updates aural routing information stored in roadside remote stations at periodic intervals. A moving vehicle senses the location of a roadside statio... | 01/19/1982 |
| 4274091 | Road surface ice detector and method for vehicles Method and apparatus for detecting from vehicles the presence of ice on roads comprising means for generating a light pulse train whose amplitude is modulated in the presence of ice on the travelling surface, means for detecting modulation of the pulse tr... | 06/16/1981 |
| 4251797 | Vehicular direction guidance system, particularly for interchange of information between road mounted units and vehicle mounted equipment A circuit is provided to detect the direction of movement of the vehicle with respect to a fixed road mounted loop, which can then extend over opposing lanes of a highway network, the direction detecting equipment being mounted either on the vehicle, or c... | 02/17/1981 |
| 4229727 | Vehicle speed alarm A vehicle speed alarm is used to alert a driver of a vehicle that the instantaneous speed thereof has exceeded a pre-established maximum vehicular speed. The speed alarm produces a reference signal upon receipt of a transmitted signal containing informati... | 10/21/1980 |
| 4196412 | Driver alert system Apparatus for insuring a vehicle operator's attentiveness at potentially dangerous locations along a path of travel. A signalling device is provided in advance of a potentially dangerous location, in the direction of travel of the vehicle. A vehicle carri... | 04/01/1980 |
| 4185265 | Vehicular magnetic coded signalling apparatus Coded binary signals are coupled to an automotive vehicle by a magnetic signpost embedded in a traversed roadway lane. The signpost includes polarity coded magnetic pole faces having vertically directed flux lines at differing spaced longitudinal regions ... | 01/22/1980 |
| 4176352 | Apparatus for deriving information concerning the movements of a vehicle The invention provides an apparatus for deriving information concerning the movement of a road vehicle. In a preferred example a single microwave source is mounted under the vehicle to illuminate the road surface. Two receiving ports are provided, one to ... | 11/27/1979 |
| 4143264 | Highway line detector A highway line detection system for an automobile which provides an output signal when a traffic line on a pavement under an automobile is about to be crossed. It includes a photoelectric sensor connected to an electrical bridge circuit, and the bridge ci... | 03/06/1979 |
| 4101870 | Device for indicating speed levels for motor vehicles In a method and device for indicating speed levels of a motor vehicle, the speed as well as danger factors are transformed into parameters, which are combined. Their combination is compared with a threshold value, for possible actuation of an alarm, after... | 07/18/1978 |
| 4083008 | Method and circuit for generation of digitally frequency-shiftable electric signals A first counter operating as a frequency-shiftable frequency divider is caused to reset before its normal count recycle in one setting of a flip-flop to reduce the factor of frequency division in response to a keying signal. A second counter, operating on... | 04/04/1978 |
| 4079322 | Automatic vehicle monitoring system An automatic vehicle monitoring system utilizing a plurality of spaced magnetic fields disposed along a vehicle path. A vehicle mounted sensor produces electrical signals in response to the presence of the magnetic fields. These signals are processed to d... | 03/14/1978 |
| 4069888 | Traffic system, especially public local passenger traffic system A traffic system, especially a public local passenger traffic system, with self-propelled trackless steerable vehicles travelling on special lanes. Beam reflectors, especially sound reflectors are arranged along the entire length of the lane true to the s... | 01/24/1978 |
| 4023017 | Electronic traffic control system A traffic control system having a number of detectors spaced along a roadway being monitored. The detectors are organized in groups, each group being interconnected to a different post. The posts include transmission and reception equipment for communicat... | 05/10/1977 |
| 3996554 | Data transmission system A data transmission system for a road vehicle has an aerial on the road vehicle for picking up signals from an external transmitter. This aerial passes a signal to a receiver on the vehicle which in turn passes the information to a memory unit which store... | 12/07/1976 |
| 3976970 | Process and device for analizing and validating signals usable in warning systems for road-signs Two orientated magnetic field generating means such as permanent magnets are embedded in a roadway at some distance from each other before a road-sign, said magnets extending on the whole width of the roadway. When a vehicle equipped with a detector cross... | 08/24/1976 |
| 3949401 | Frequency identification circuit for broadcast traffic information reception systems Frequencies which respectively identify a particular transmitter, and a particular program content, and which are in a very low frequency range (from between 20 to 125 kHz can be recognized, and ditigal output control signals derived representative of whe... | 04/06/1976 |
