Variable Speed Traffic Control System
First Claim
Patent Images
1. A variable speed limit sign comprising:
- a controller comprising;
a first radio clock with an output to synchronize the controller with a traffic control device synchronized by a second radio clock, wherein the traffic control device is programmed with a predictable output schedule;
a programmable memory device containing the timing sequence of the upcoming traffic control device and one or more traffic schedules;
a processor for determining the variable speed limit for a vehicle to maintain to avoid a stop signal at the upcoming traffic control device; and
a display operatively coupled to the controller for communicating the variable speed limit to the vehicle.
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Abstract
A variable speed limit sign including a controller and a display operatively coupled to the controller is provided. A traffic control system including a variable speed limit sign and methods of use thereof are also provided.
23 Citations
21 Claims
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1. A variable speed limit sign comprising:
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a controller comprising; a first radio clock with an output to synchronize the controller with a traffic control device synchronized by a second radio clock, wherein the traffic control device is programmed with a predictable output schedule; a programmable memory device containing the timing sequence of the upcoming traffic control device and one or more traffic schedules; a processor for determining the variable speed limit for a vehicle to maintain to avoid a stop signal at the upcoming traffic control device; and a display operatively coupled to the controller for communicating the variable speed limit to the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A traffic control system comprising:
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a traffic control device that is preprogrammed by a central control station synchronized by a first radio clock; one or more variable speed limit signs for communicating with a first oncoming vehicle a variable speed limit to avoid a stop signal in the traffic control device comprising; a controller comprising; a first radio clock with an output to synchronize the controller with a traffic control device synchronized by a second radio clock, wherein the traffic control device is programmed with a predictable output schedule; a programmable memory device containing the timing sequence of the upcoming traffic control device and one or more traffic schedules; a processor for determining the variable speed limit for a vehicle to maintain to avoid a stop signal at the upcoming traffic control device; and a display operatively coupled to the controller for communicating the variable speed limit to the vehicle or optionally display, transmit, or display and transmit a programming status of the controller. - View Dependent Claims (16, 17, 18)
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19. A method of regulating traffic with a variable speed limit sign comprising:
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providing a variable speed limit sign synchronized using a first radio clock with a traffic control device synchronized with a second radio clock; determining the time before the traffic control device displays a stop signal; determining the variable speed that a vehicle should maintain to avoid the stop signal at the traffic control device; displaying the required speed for the vehicle to maintain to avoid the stop signal at the traffic control device; wherein the variable speed limit sign comprises; a controller comprising; a first radio clock with an output to synchronize the controller with a traffic control device synchronized by a second radio clock, wherein the traffic control device is programmed with a predictable output schedule; a programmable memory device containing the timing sequence of the upcoming traffic control device and one or more traffic schedules; a processor for determining the variable speed limit for a vehicle to maintain to avoid a stop signal at the upcoming traffic control device; and a display operatively coupled to the controller for communicating the variable speed limit to the vehicle. - View Dependent Claims (20, 21)
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Specification