US6137424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Passive road sensor for automatic monitoring and method thereof
Assignee: Tracon Systems Ltd
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Filing: 1999-01-15
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Granted: 2000-10-24
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Expires: 2019-01-15
Abstract
Abstract An automatic traffic monitoring system for enforcing traffic laws and regulations and for general purpose traffic monitoring includes a novel passive road sensor that accurately detects the kinematics of moving vehicles. A passive road sensor includes a detector protected in an enclosure, which is embedded in a road opening, is in a continuous listening mode. When the wheels of a passing vehicle come in contact with either the road opening, the enclosure, or both, the resulting mechanical impact generates a disturbance that triggers the detector. A processor unit of the automatic traffic monitoring system records the signal sensed by the detector and analyzes its temporal characteristics to determine the precise time of impact.
Inventors
- 👤 Simon S. Cohen
- 👤 Oded Kafri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:52
CPC Classifications
G; G08; G08G; G08G1/00; G08G1/01; G08G1/02; E; E01; E01F; E01F11/00
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
66 words
A system for passively monitoring traffic flow and adherence to traffic laws and regulations comprising: a passive road sensor comprising: an acoustic signal generator installed in or on the road surface; and a detector to detect an acoustic signal generated from impact of wheels of a vehicle to the generator as the vehicle is driven over the generator and conducted through the generator to the detector.
Claim 2
Independent Claim
66 words
A system for passively monitoring traffic flow and adherence to traffic laws and regulations comprising: a passive road sensor comprising: an acoustic signal generator installed in or on the road surface; and a detector to detect an acoustic signal generated from impact of wheels of a vehicle to the generator as the vehicle is driven over the generator and conducted through the generator to the detector.
Claim 3
Dependent Claim
25 words
A system as claimed in claim 1 wherein the acoustic signal generator comprises a pipe, the pipe also serving as a housing for the detector.
Claim 4
Dependent Claim
26 words
A system as claimed in claim 2, the pipe being positioned within an opening in the road which essentially spans the entire width of the road.
Claim 5
Dependent Claim
13 words
A system as claimed in claim 3 wherein the detector is a microphone.
Claim 6
Dependent Claim
26 words
A system as claimed in claim 2, the pipe being positioned on a surface of the road and essentially spanning the entire width of the road.
Claim 7
Dependent Claim
13 words
A system as claimed in claim 5 wherein the detector is a microphone.
Claim 8
Dependent Claim
13 words
A system as claimed in claim 2 wherein the detector is a microphone.
Claim 9
Dependent Claim
38 words
A system as claimed in claim 1 wherein the acoustic signal generator comprises: a plurality of non-flexible housing segments of length between 20 cm and 100 cm, connected by flexible pipe joints between 10 and 50 cm long.
Claim 10
Dependent Claim
91 words
A system as claimed in claim 1 further comprising: an integrated event recording and reporting system in direct communication with the passive road sensor comprising a processing unit, a video camera and a communication module, wherein the signal from the passive road sensor causes the processor unit to engage the video camera to capture an image of the passing vehicle and to communicate data corresponding to the image to a separate control unit by means of the communication module, whereupon the processing unit generates a report to a traffic law violation.
Claim 11
Dependent Claim
58 words
A system as claimed in claim 9 wherein signals from a plurality of passive road sensors are used to determine vehicle velocity and acceleration, relative distance between two vehicles, distance between axles of a single vehicle, and vehicle compliance with a traffic "stop" sign, a traffic "yield" sign, a solid line division in the road, and/or traffic lights.
Claim 12
Dependent Claim
51 words
A system as claimed in claim 1, the acoustic signal generator further including: a metal plate rigidly fixed across a lane of a road; and a pipe, portions of which are rigidly attached to a surface of the plate such that remaining lengthy portions of the pipe are free to vibrate.
Claim 13
Dependent Claim
42 words
A system as claimed in claim 11 wherein the generator is invertably fixed to the road so that the pipe is embedded into a slot formed in the lane, the slot being sufficiently large to receive the pipe without touching the pipe.
Claim 14
Dependent Claim
19 words
A system as claimed in claim 12 wherein the top surface of the plate is roughened by small protrusions.
Claim 15
Dependent Claim
20 words
A system as claimed in claim 13 wherein the end of the pipe is hermetically sealed after inserting the detector.
Claim 16
Dependent Claim
25 words
A system as claimed in claim 13 wherein the detector comprises a plurality of microphones spaced about 1 meter apart inside the acoustic signal generator.
Claim 17
Dependent Claim
24 words
A system as claimed in claim 15 wherein each microphone comprises a microphone element enclosed within a casing, the casing being filled with epoxy.
Claim 18
Dependent Claim
38 words
A system as claimed in claim 12 wherein the top surface of the plate is bent to form a triangular protrusion about 2 to 10 mm in height and 4 to 20 mm in width at its base.
Claim 19
Dependent Claim
20 words
A system as claimed in claim 17 wherein the end of the pipe is hermetically sealed after inserting the detector.
Claim 20
Dependent Claim
25 words
A system as claimed in claim 17 wherein the detector comprises a plurality of microphones spaced about 1 meter apart inside the acoustic signal generator.
Claim 21
Dependent Claim
24 words
A system as claimed in claim 19 wherein each microphone comprises a microphone element enclosed within a casing, the casing being filled with epoxy.
Claim 22
Dependent Claim
20 words
A system as claimed in claim 11 wherein the end of the pipe is hermetically sealed after inserting the detector.
Claim 23
Dependent Claim
25 words
A system as claimed in claim 11 wherein the detector comprises a plurality of microphones spaced about 1 meter apart inside the acoustic signal generator.
Claim 24
Dependent Claim
24 words
A system as claimed in claim 22 wherein each microphone comprises a microphone element enclosed within a casing, the casing being filled with epoxy.
Claim 25
Dependent Claim
20 words
A system as claimed in claim 12 wherein the end of the pipe is hermetically sealed after inserting the detector.
Claim 26
Dependent Claim
25 words
A system as claimed in claim 12 wherein the detector comprises a plurality of microphones spaced about 1 meter apart inside the acoustic signal generator.
Claim 27
Dependent Claim
24 words
A system as claimed in claim 25 wherein each microphone comprises a microphone element enclosed within a casing, the casing being filled with epoxy.
Claim 28
Independent Claim
155 words
A method of monitoring and recording traffic flow and traffic-law violation events comprising: providing openings on a road; providing passive road sensors, each including a sound detector enclosed within an enclosure, the enclosure being positioned within each road opening on the road, and the sensors in continuous communication with a remote control processing unit; providing a video camera in line with the sensors to capture images of traffic flow events; providing a communication module to pass images to the processing unit; measuring vibrations caused by wheel impact of a moving vehicle with the road sensors to generate signals in the detectors, the signals triggering a computing process in a central processing unit to determine the nature of the traffic event; and activating an operating system in the processing unit to communicate with the road sensors to control the video camera and communication module, to automatically generate a report and citation to a traffic law violator.
Claim 29
Independent Claim
155 words
A method of monitoring and recording traffic flow and traffic-law violation events comprising: providing openings on a road; providing passive road sensors, each including a sound detector enclosed within an enclosure, the enclosure being positioned within each road opening on the road, and the sensors in continuous communication with a remote control processing unit; providing a video camera in line with the sensors to capture images of traffic flow events; providing a communication module to pass images to the processing unit; measuring vibrations caused by wheel impact of a moving vehicle with the road sensors to generate signals in the detectors, the signals triggering a computing process in a central processing unit to determine the nature of the traffic event; and activating an operating system in the processing unit to communicate with the road sensors to control the video camera and communication module, to automatically generate a report and citation to a traffic law violator.
References Cited (Backward Citations)
US4360795A
Cited
US5008666A
Cited
US5041828A
Cited
WO1989006413A1
Cited
US5066950A
Cited
US5150618A
Cited
US5204675A
Cited
US5057831A
Cited
FR2675610A1
Cited
US5239148A
Cited
US5554907A
Cited
US5491475A
Cited
US5373487A
Cited
US5586028A
Cited
US5668540A
Cited
US5512891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-10-24 | 2004-04-24 | 2004-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-10-24 | 2008-04-24 | 2008-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-10-24 | 2012-04-24 | 2012-10-24 | $7700.00 | Window Closed / Lapsed |