Traffic monitoring system
First Claim
Patent Images
1. A traffic monitoring system comprising:
- first, second, third and fourth strip sensors in a road surface;
the first sensor being a pre-selector group and the second, third and fourth sensors being a first selector group;
the pre-selector group being spaced in a direction of travel along the road surface by at least one meter and the sensors in the first selector group being spaced from each other in the direction of travel a distance selected to distinguish different tire print lengths of a selected category of vehicles; and
the sensors being solid-state weight in motion sensors, each having substantially similar design, wherein edges of each sensor emit a start signal precisely upon initial contact by a vehicle upon the sensor edges, thereby providing a precision switch sensor.
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Abstract
A traffic management systems, combining different monitoring capabilities, beginning with standard WIM (Weigh in Motion) systems for axle weight measurements, combined with tire pressure monitoring in motion and suspension monitoring in motion, whereby for all three specialties, novel road embedded force measuring sensors are used, partly for force measurement and partly for switching operation upon touching the edge of the sensors by the onrolling tire, whereby all possible combinations of the three specialties are within the scope of the invention.
49 Citations
10 Claims
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1. A traffic monitoring system comprising:
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first, second, third and fourth strip sensors in a road surface;
the first sensor being a pre-selector group and the second, third and fourth sensors being a first selector group;
the pre-selector group being spaced in a direction of travel along the road surface by at least one meter and the sensors in the first selector group being spaced from each other in the direction of travel a distance selected to distinguish different tire print lengths of a selected category of vehicles; and
the sensors being solid-state weight in motion sensors, each having substantially similar design, wherein edges of each sensor emit a start signal precisely upon initial contact by a vehicle upon the sensor edges, thereby providing a precision switch sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A traffic monitoring system comprising:
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first, second, third and fourth strip sensors in a road surface;
the first sensor being a pre-selector group and the second, third and fourth sensors being a first selector group;
the pre-selector group being spaced in a direction of travel along the road surface by at least one meter and the sensors in the first selector group being spaced from each other in the direction of travel a distance selected to distinguish different tire print lengths of a selected category of vehicles; and
the sensors being weight in motion sensors having substantially similar design, wherein the sensors have solid state design and a sensor edge which gives an accurate start signal when initially contacted by a given vertical force, the sensors having a very small error range, resulting in a precision switch sensor.
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10. A traffic monitoring system comprising:
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first, second, third and fourth strip sensors in a road surface;
the first sensor being a pre-selector group and the second, third and fourth sensors being a first selector group;
the pre-selector group being spaced in a direction of travel along the road surface by at least one meter and the sensors in the first selector group being spaced from each other in the direction of travel a distance selected to distinguish different tire print lengths of a selected category of vehicles; and
the sensors being weight in motion sensors having substantially similar design, wherein the sensors function as a force sensor as well as a contact switch of high precision, where a switching point of the sensor coincides with a load sensitive edge of the sensor, having an additional switching arrangement that is actuated by a sharp signal rise when a load touches the load sensitive edge of the sensor.
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Specification