Passive railroad crossing warning system

Details Passive railroad crossing warning system Passive railroad crossing warning system

1991-02-26

1992-07-14

Dzierzynski, Paul M.

Optical: systems and elements

Signal reflector

Mounted adjacent roadway

359547, 404 9, G02B 504, E01F 900

Patent

active

051308487

ABSTRACT:
A passive railroad crossing warning device has two input optical windows that receive light from the headlight of an oncoming locomotive. The light is redirected to an output optical window where a combiner causes it to exit at a predetermined angle to make it visible to motorists approaching the railroad crossing.

REFERENCES:
patent: 3814500 (1974-06-01), Ebenbichler
patent: 4252409 (1981-02-01), Schwab
patent: 4776671 (1988-10-01), Sumi et al.

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