Indicating apparatus from preventing vehicles from colliding with each other as they pass
First Claim
1. An indicating apparatus for preventing vehicles from colliding as they pass through an intersection having visual obstructions, the intersection including a first road on which vehicles do not stop before passing through the intersection and a second road on which vehicles must temporarily stop before entering the intersection, the apparatus comprising:
- vehicle sensing means located along the first road a predetermined distance from said intersection for detecting vehicles approaching said intersection on the first road;
alarm indicating means located at a predetermined point on the second road; and
control means for causing said alarm indicating means to Actuate an alarm for a predetermined interval of time after said vehicle sensing means detects a first vehicle approaching said intersection on the first road and for causing said alarm indicating means to continue actuating said alarm if said vehicle sensing means detects a second vehicle approaching said intersection on the first road before said first vehicle has passed said intersection.
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Abstract
An indicating apparatus for preventing vehicles from colliding with each other as they pass an intersection of roads includes a vehicle sensing device placed on one of the roads a predetermined distance from the intersection for sensing a vehicle approaching the intersection, an alarm indicating device placed at the predetermined point on the other road, and a control device for causing the alarm indicating device to indicate alarm when the vehicle sensing device detects a vehicle approaching the intersection.
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Citations
15 Claims
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1. An indicating apparatus for preventing vehicles from colliding as they pass through an intersection having visual obstructions, the intersection including a first road on which vehicles do not stop before passing through the intersection and a second road on which vehicles must temporarily stop before entering the intersection, the apparatus comprising:
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vehicle sensing means located along the first road a predetermined distance from said intersection for detecting vehicles approaching said intersection on the first road; alarm indicating means located at a predetermined point on the second road; and control means for causing said alarm indicating means to Actuate an alarm for a predetermined interval of time after said vehicle sensing means detects a first vehicle approaching said intersection on the first road and for causing said alarm indicating means to continue actuating said alarm if said vehicle sensing means detects a second vehicle approaching said intersection on the first road before said first vehicle has passed said intersection. - View Dependent Claims (2, 3, 4)
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5. An apparatus for signalling a traffic condition at an intersection, comprising:
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a sensor for sensing vehicles travelling on a first road passing through the intersection, the first road having traffic preference such that the vehicles do not stop before passing through the intersection; an indicating device located at a predetermined position along a second road on which vehicles must temporarily stop before passing through the intersection; a controller, coupled to the sensor, for controlling the indicating device for a first predetermined period of time after a first vehicle is sensed travelling on the first road and for controlling the indicating device for a second predetermined period of time after a second vehicle is sensed travelling on the first road if the second vehicle is sensed during the first predetermined period of time. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method for signalling a traffic condition at an intersection comprising the step of:
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sensing vehicles travelling on a first road passing through the intersection, the first road having traffic preference such that the vehicles do not stop before passing through the intersection; indicating for a first predetermined period of time at a predetermined position along a second road that a first vehicle has been sensed travelling on the first road, the vehicles traveling on the second road temporarily stopping before passing through the intersection; and indicating for a second predetermined period of time at the predetermined position along the second road when a second vehicle has been sensed travelling on the first road during the first predetermined period of time. - View Dependent Claims (14, 15)
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Specification