The British (actually England, Wales and Northern Island) have the design covered by law (TSRGD 2016). Scotland have minor change in the regulations. The sound

The British (actually England, Wales and Northern Island) have the design covered by law (TSRGD 2016). Scotland have minor change in the regulations. The sounder (aka bleeper) and device (aka tactile) are for visually impaired pedestrians. In Scotland, you can also have a voice telling you the vehicles has a red (e.g. Vehicles heading North on Main Street have been given a red signal). Systems in other counties have advantages and disadvantages (IMHO), lack of a clear standard compared to background noise. Too complex, so problems in maintenance. However some difference in sounds give a better indication to pedestrians on the start/middle/end of crossing time. There is also Countdown - http://content.tfl.gov.uk/PCaTS-Note-2-Overview-Presentation.pdf http://content.tfl.gov.uk/PCaTS-Note-2-Overview-Presentation...