Communications: electrical – External condition vehicle-mounted indicator or alarm – Transmitter in another vehicle
Patent
1997-08-22
1998-09-01
Crosland, Donnie L.
Communications: electrical
External condition vehicle-mounted indicator or alarm
Transmitter in another vehicle
340904, 3409081, 340331, 340691, G08G 100, B60Q 700
Patent
active
058016465
ABSTRACT:
A two-stage traffic alert system, and a method for its use, to visually alert pedestrians and operators of surface vehicles to the approach of emergency vehicles toward roadway intersections. A wireless signal transmitter mounted to an emergency vehicle automatically transmits a signal of a predetermined frequency while the emergency vehicle is en route to an emergency destination. The signal is received by at least one ground-based signal receiver and strobe light assembly mounted centrally within the pavement of approaching intersections. The transmitted signal first actuates an upper strobe light system within the ground-based assembly, alerting the public to the approach of the emergency vehicle toward the intersection. The initiation of the upper strobe light comprises the first stage of the traffic alert system. The second stage of the traffic alert system is initiated either by a time delay command based on the time of receipt of the first signal or a change in signal frequency from the transmitter. During second stage alert, the ground-based assembly translates vertically from the surface of the pavement and activates side mounted strobe lights while maintaining activation of the upper strobe light, further alerting the public to the approach of the emergency vehicle. The traffic alert system can be manually overridden by emergency workers as needed.
REFERENCES:
patent: 2829362 (1958-04-01), Terrill
patent: 4713910 (1987-12-01), Quante
patent: 4843337 (1989-06-01), Conn, Jr. et al.
patent: 4857921 (1989-08-01), McBride et al.
patent: 5552767 (1996-09-01), Toman
Crosland Donnie L.
Morse Dorothy S.
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