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5021778 |
Capacitance coupled proximity identification system
A reader section has a reader circuit connected to three parallel metal plates. The center plate is excited by an alternating voltage and the other two plates are excited by an inverse voltage. An...
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5019815 |
Radio frequency controlled interrogator-responder system with passive code generator
An electronic system for automatically identifying objects employing microminiature electronic circuitry supported by each object and containing three operable subsystems, (a) a means for...
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5008666 |
Traffic measurement equipment
Traffic measurement equipment has a pair of coaxial cables having barium titanate piezo-electric responsive crystals embedded in the polymer together with a vehicle presence detector to indicate...
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4970389 |
Vehicle identification system
Vehicle (4) are automatically identified using a specially constructed windshield (8) which carries identifying indicia (10). The window is a layered construction, similar to safety glass, and...
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4968979 |
Vehicle detecting system
A vehicle detecting system for detecting the number of vehicles which pass the roadway, thereby realizing the smooth flow of vehicles. This system comprises: a transmitting coil and a receiving...
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4945356 |
Strip material for and a surface mounted inductive loop
A strip material (18) for forming an inductive loop (10) adapted to be applied to the surface of a roadway (12). The strip material (18) consists of and the loop (10) is formed from a ductile,...
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4943805 |
Conduit-enclosed induction loop for a vehicle detector
An induction loop and a method of making an induction loop having conduit sections connected by a coupling assembly. The coupling assembly includes a passageway-defining body having ends for...
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4939512 |
Modular, non-metallic, hard shell, predimensioned, preformed and sealed induction loop vehicle detection system and method of installation
An induction loop vehicle detection system and method of making and installing such a system are disclosed wherein the conduit sections containing the induction loop are preformed and prewired...
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4920340 |
Vehicle detecting method and system which can communicate with vehicles
A vehicle detecting system detects the existence of a vehicle on a roadway and communicates therewith in the following manner. A pair of transmitting and receiving coils are arranged on both sides...
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4908615 |
Traffic light control system and method
Preferred embodiments include a radar traffic light control system with a transmitter/receiver module including an array (103) of interconnected microstrip patch antennas (38) which also act as the...
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4868538 |
Random signature island circuit
An island circuit detects the presence of a train on a crossing island, and, in response, de-energizes a normally energized relay to activate a warning. A random signature signal is generated and...
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4863123 |
Process and system for localizing a mobile unit which travels on a system of railroads
A process for localizing a mobile unit on a railway network, with a system that includes: a sensor (R) in the form of radar having an antenna (A) which is integral to the mobile unit and that...
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4862163 |
Traffic monitoring system
An improved traffic monitoring system is disclosed in which a microprocessor is connected to an analog to digital converter providing a series of digital samples of the pressure within a road tube...
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4855737 |
Track circuit signalling arrangement
A digital signal is used for railway track circuit signalling. A digital signal comprises a pseudo-random binary sequence selected from a set of such sequences. The set is chosen to give the lowest...
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4839648 |
Method of determining the trajectory of a body suitable for moving along a portion of a path, and apparatus for implementing the method
A method of determining the trajectory of a body (1) such as a vehicle body on a relatively plane path portion (2), the method being characterized in that it consists: in forming a main real image...
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4789941 |
Computerized vehicle classification system
A computerized ultrasonic system is disclosed for classification of vehicular traffic, as at a toll collection booth. An ultrasonic ranging unit is mounted above the traffic lane, facing downward....
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4787581 |
Train detection system operating in accordance with the axle-counting principle
A train detection system is disclosed which works on the axle-counting principle and in which preprocessing units each containing a two-microprocessor system are associated with the individual...
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4670844 |
Traffic control system for drive-in banks
A novel drive-in traffic control for a bank which includes a computer for controlling the various signs, teller stations, supervisor's desk panel, sensors and a printer and which has provisions for...
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4661799 |
Loop detector
An inductive loop detector which includes a detector which is coupled to the loop by means of a parallel tuned circuit and a receiver which is coupled to the loop by means of a parallel tuned...
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4603640 |
Device for incrementally identifying the vehicle position of a magnet levitation vehicle
The incremental detection of the vehicle position of a magnetic levitation vehicle, particularly having an elongate stator motor, can occur with at least one coded measuring strip which extends in...
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4582279 |
Modulation system for railway track circuits
A modulation system for railway track circuits in which a modulated signal is applied to a section of track for the purpose of detecting the presence or absence of a train on the section. Such...
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4566008 |
Fault detecting circuit and method for a vehicle detector system
Apparatus and method for a circuit which is connected in series between the call signal output of a vehicle detector and the call signal input of a traffic controller is disclosed. Under normal...
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4549182 |
System for encouraging the return of vehicles such as trolleys
Users need to be encouraged to return vehicles such as airport baggage trolleys or supermarket trolleys to a vehicle storage area. The area is equipped with an entrance fitted with a system for...
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4532511 |
Automatic vehicle identification system and method
An automatic vehicle identification system for use in identifying and routing vehicles, such as railway cars or other vehicles which routinely travel a given track or path. A passive electronic...
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4529982 |
Vehicle locating system
Location-representative signals are communicated to vehicles (12, 14, 16) by modifying existing traffic detector stations of the type utilizing an inductive coil (20) embedded in the roadway (22)....
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4491840 |
Intervehicle distance control system for vehicles
An intervehicle distance control system for a vehicle which, when there exists a possibility of collision between the vehicle and an interfering object ahead thereof, generates a control signal and...
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4481516 |
Low visibility runway monitor
A runway collision avoidance system having warning devices is provided for the safety of aircraft taxiing, taking off, and landing. The system is capable of detecting ground traffic and obstacles...
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4438429 |
Emergency signal transceiver for disabled car
An emergency signal transceiver for a disabled vehicle for generating a repetitive pulse signal, digital apparatus for producing a pulse signal from such a received repetitive pulse signal for...
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4433325 |
Optical vehicle detection system
An optical vehicle detection system comprising camera means for catching the image of a vehicle running in a selected roadway lane to generate an output video signal, inquiring means for inquiring...
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4430636 |
Loop detector for traffic signal control
A circuit used in a traffic control apparatus for detecting changes in the frequency of an oscillator which has an inductive loop-sensor as a resonating element. The circuit comprises a...
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4383239 |
Detector for detecting the passage of heavy objects on a roadway
A detector for detecting the passage of heavy objects on a roadway, wherein the detector is an elongate strip in the form of nested channel-section members, said members comprising, from the...
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4374299 |
Triboelectric transducer cable
Two embodiments of a triboelectric transducer cable for generating a signal in response to movement or deformation of the cable each include multiple insulated central conductors, a semi-conductive...
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4370718 |
Responsive traffic light control system and method based on conservation of aggregate momentum
A system to improve traffic flow on all types of interconnected roadways, which reduces fuel consumption, emissions and trip times, is based on adaptive control of traffic signal timing. The...
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4364043 |
Efficient object identification system
A system for the remote identification of objects using near-field electromagnetic coupling between an interrogator a transponder and a receiver in which a reply carrier at a subharmonic of the...
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4360795 |
Detection means
An apparatus for determining the time of the closest point of approach of a taxiing aircraft comprising a microphone means for producing an input signal in response to the sound energy of a taxiing...
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4358749 |
Object detection
In a vehicle detector installation employing an inductive sensing loop that is a frequency determining element of an oscillator, the oscillator is provided with a voltage controlled capacitor as...
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4353054 |
Stop sign watcher, a device for monitoring vehicles at full stop sign intersections
A STOP SIGN monitoring device; containing a counter, audible alarm and switching provisions for photographic equipment. An electrical pulse is generated whenever a vehicle fails to make a defined...
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4352086 |
Method and a circuit arrangement for modifying control information in a traffic signal system, particularly a street traffic signal system
A method and a circuit arrangement for modifying central control information commands forming signal programs in traffic signal systems in particular street traffic signal systems, the central...
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4317117 |
Cross correlated doppler radar/infra red velocity and presence sensor
A doppler radar and infra red sensor focused by common means onto a region, will, with appropriate cross correlation, provide improved velocity and presence sensing in a complex uncontrolled...
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4315242 |
Device for determining the moment when competitors in a race are passing the finishing line
Each competitor in a race is provided with a transmitter. At the finishing line, two receiving antennae (10,11) are mounted which, when the finishing line is passed, are responsive to the field of...
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4271512 |
Information collection and storage system with memory test circuit
An information recording system having an electrical circuit for counting serially occurring pulses, the number of which is indicative of certain information, a memory storage unit adapted to be...
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4229726 |
Portable electronic traffic event recorder
Apparatus for recording traffic events occurring at a variety of vehicular traffic passageways, such apparatus including a portable housing unit having a keyboard presenting a predetermined pattern...
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4219878 |
Speed measuring device
A special accessory for traffic radar devices includes two operating routines. These routines are to be used with a programmable microprocessor which comprises a portion of the traffic radar...
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4219802 |
Scanning barrier for the discrimination and counting of objects and more specifically of vehicles in transit through a laminar barrage of electromagnetic microwaves
A scanning barrier which can detect and discriminate objects which are within the scanned area. A transmitter on one side of the scanned area transmits a laminar barrage of electromagnetic...
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4209783 |
Object identification system
A transmitting/receiving antenna radiates a sweep frequency signal as an interrogation signal to an answer device. The answer device includes a plurality of resonators which are connected in...
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4192394 |
Alarm system for platform scale
To prevent inaccurate weighing on a platform scale in the event that a driver of a motor vehicle has purposefully or inadvertently positioned his vehicle with one or more of the vehicle wheels...
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4182989 |
System for establishing a communication link between a ground station and each of vehicle drivers within a limited communication area
a system for establishing a communication link between a ground station and each of vehicle drivers, wherein information is transferred in a compressed manner with respect to time while a vehicle...
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4126856 |
Scales annunciator
An annunciator to indicate the presence of a truck on a weighing platform to a weigh station operator is disclosed. The apparatus includes a presence sensor operable in response to the weight of...
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4068211 |
Vehicle identification system having error detection means
Vehicle identification system comprising a carrier period detector in which, to increase the accuracy of identification signals received, the identification signal is rejected and a new...
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4064501 |
Control system
By this invention a system for controlling the servicing of customers arriving in a vehicle at a service area is provided, in which system the arrival of the vehicle, the supplying of the services...
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