Audible and vibrotactile indications of start of “walk”, and not generally as a guide across the intersection. Under normal conditions, two sounds are used. The sounds are:
- Bird call “cuckoo” for the north-south direction. This sound consists of alternating higher and lower tones, with each tone sounding for approximately 70 ms. The time between the first and second
- Tones in the sequence should be approximately 0.3 seconds. The full sequence should repeat approximately every 1.5 seconds; and
- The “Canadian Melody” sound incorporates multiple (i.e., mixed or changing) frequencies, ranging from 500 Hz to 1000 Hz, with higher harmonics. These are ideal for localization of sounds, mitigating lateral deviation, and for pedestrians with age-related hearing loss. The ‘A-Weighted’ sound pressure levels should conform to ISO 1996-1:1982 and ISO 1996-2:1987.
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