Abstract: A monitoring system includes a transmitter (102) with two transmit modules (208, 210) and a receiver (104) with two receive modules (212, 214). Each of the transmit modules (208, 210) generates an optical signal modulated at a unique frequency. The optical signals are transmitted across a roadway (112) and are detected by the receive modules (212, 214). When a vehicle (110) moves between the transmitter (102) and receiver (104), the optical signals are blocked. The receiver (104) generates timestamped make and break events corresponding to the blocking and unblocking of the signals, and these are used to determine parameters for the vehicle (110) such as velocity and vehicle classification. Because each signal is modulated at a different frequency, each receive module (212, 214) can distinguish the signals received from each of the transmit modules (208, 210), allowing the lane position of the vehicle (110) in a multi-lane roadway (112) to be determined.

Abstract: A two-part fluid resistant information display system for multiple uses such as merchandising is disclosed. The display system combines a first removably mountable part, partially impermeable pocket that cooperates sealingly with a second part shelf mountable clip assembly. The pocket is defined between a first and a second flat panel sealed on their sides. One pocket panel opening edge has an inwardly protruded channel being pressed against the second flat panel to provide sealing. Pressure is exerted by a projection provided in the clip assembly. The clip assembly further comprises an upper flexible hinge that is hingingly joined to a mounting panel that can be mounted to multiple surfaces such as lips of a C-channel of a merchandising shelf, vertical and horizontal surfaces using fastener means such as magnetic, mechanical or chemical fastener means. The inexpensively produced information display system provides fluid resistance against contaminants coming from all directions.

Abstract: A monitoring system includes a transmitter (102) with two transmit modules (208, 210) and a receiver (104) with two receive modules (212, 214). Each of the transmit modules (208, 210) generates an optical signal modulated at a unique frequency. The optical signals are transmitted across a roadway (112) and are detected by the receive modules (212, 214). When a vehicle (110) moves between the transmitter (102) and receiver (104), the optical signals are blocked. The receiver (104) generates timestamped make and break events corresponding to the blocking and unblocking of the signals, and these are used to determine parameters for the vehicle (110) such as velocity and vehicle classification. Because each signal is modulated at a different frequency, each receive module (212, 214) can distinguish the signals received from each of the transmit modules (208, 210), allowing the lane position of the vehicle (110) in a multi-lane roadway (112) to be determined.