An alarm system for deterring unauthorised access to a target area, as may be used, for example, at railway level crossings. An alarm output device arranged to direct an alarm output into the target area.
TRESPASSING DETERRENCE FOR RAILWAYS
ABSCHRECKUNG GEGEN UNBEFUGTES BETRETEN VON BAHNANLAGEN
DISSUASION CONTRE LES INTRUSIONS DANS LES CHEMINS DE FER
2023-03-08
Patent
Electronic Resource
English
Springer Verlag | 2009
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