Back Automatic warning system Catalan Automatic Warning System Czech Automatic Warning System German Sistema de alarma automático Spanish Automatic Warning System French 自動列車警報装置 Japanese 자동 경고 시스템 Korean Automatic Warning System Dutch Sistema de alerta automático Portuguese 列車自動警告系統 Chinese
Automatic Warning System (AWS) is a railway safety system invented and predominantly used in the United Kingdom. It provides a train driver with an audible indication of whether the next signal they are approaching is clear or at caution.[1] Depending on the upcoming signal state, the AWS will either produce a 'horn' sound (as a warning indication), or a 'bell' sound (as a clear indication). If the train driver fails to acknowledge a warning indication, an emergency brake application is initiated by the AWS. However if the driver correctly acknowledges the warning indication by pressing an acknowledgement button, then a visual 'sunflower' is displayed to the driver, as a reminder of the warning.
- ^ "AWS & TPWS Handbook: Section 1.1.3 "The purpose of AWS"". RSSB. Archived from the original (PDF) on 5 December 2016. Retrieved 7 February 2017.