Abstract
We all recognise the siren of an emergency vehicle, but none of us is able to tell which direction it is coming from. We can identify “what” but not “where”. This is due to the narrowband nature of traditional sirens which, due to the paucity of frequencies utilised, make it impossible for the brain to compute the location of the approaching emergency vehicle. Trials of a new siren sound which comprises broadband noise have shown that roadusers react positively to the new sound, resulting in journey times reduced by up to 10%. The Localizer™ is thus safer for roadusers and emergency service personnel.
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