Method, system and control device for controlling light signal transmitters at intersections
First Claim
1. A method for controlling light-signal transmitters at an intersection, comprising:
- detecting a traffic condition at the intersection cyclically;
deriving characteristic traffic conditions for the intersection from the detected traffic conditions;
for each of the characteristic traffic conditions, selecting a signal program matched to the characteristic traffic condition and assigning the signal program to the characteristic traffic condition;
defining a metric as a measure of the relative positions of two traffic conditions;
determining the characteristic traffic condition that is closest to the actual traffic condition with respect to the defined metric; and
executing the signal program that is assigned to the closest characteristic traffic condition, wherein switching commands for the light-signal transmitters are issued.
1 Assignment
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Accused Products
Abstract
A system and method for providing local intersection control includes controlling light signal transmitters at an intersection. A traffic condition at an intersection is cyclically detected, a signal program is selected that is matched to the detected traffic condition, and the selected signal program issues switching commands to the light signal transmitter. Characteristic traffic conditions are derived from the detected traffic conditions for the intersection, each characteristic traffic condition is assigned a signal program matched to this traffic condition, a metric is defined as measure for positions of two traffic conditions relative to each other, the characteristic traffic condition that is closest to the actual traffic condition with respect to the metric is determined, and the signal program assigned to the closest characteristic traffic condition is executed for triggering switching commands for the light-signal transmitters. A control device is also included for realizing the method. This system has a higher flexibility during changes in the traffic conditions than purely fixed-time controls and a higher capacity with minimum planning and supply expenditure and a moderate number of detectors.
19 Citations
22 Claims
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1. A method for controlling light-signal transmitters at an intersection, comprising:
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detecting a traffic condition at the intersection cyclically;
deriving characteristic traffic conditions for the intersection from the detected traffic conditions;
for each of the characteristic traffic conditions, selecting a signal program matched to the characteristic traffic condition and assigning the signal program to the characteristic traffic condition;
defining a metric as a measure of the relative positions of two traffic conditions;
determining the characteristic traffic condition that is closest to the actual traffic condition with respect to the defined metric; and
executing the signal program that is assigned to the closest characteristic traffic condition, wherein switching commands for the light-signal transmitters are issued. - View Dependent Claims (2, 3, 4, 5, 10, 11, 12, 13, 14, 15)
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6. A control device for controlling light-signal transmitters at an intersection comprising:
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means for storing traffic conditions detected at an intersection cyclically;
means for deriving characteristic traffic conditions for the intersection from the stored traffic conditions;
means for storing the derived characteristic traffic conditions;
means for computing signal programs which are respectively matched to a stored characteristic traffic condition and are assigned to this traffic condition;
means for storing signal programs that are assigned to the characteristic traffic conditions;
means for defining a metric as a measure of the relative positions of two traffic conditions;
means for determining the characteristic traffic condition that is closest to an actual traffic condition with respect to the defined metric; and
means for executing a signal program that is assigned to the closest characteristic traffic condition, and for issuing switching commands to the light-signal transmitters. - View Dependent Claims (7, 8, 9, 16, 17, 18, 19, 20, 21, 22)
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Specification