Some 5 years ago a story like this was featured on BBC's Tomorrow's World show. They basically meant it to be used by sirens of ambulances and fire engines. The sound they demonstrated (and used on the road) was the same siren sound, but at certain intervals interleaved with plain static (the chush-chush I s'pose).
I hadn't heard anything about that for a while, but a few months after that I heard an ambulance on the road around here (Belgium) and it clearly used the interleaved static, and it DID make the sound source much more easy to be found. However, I only heard them use it twice, and not an ambulance after that has used the sound since. Don't know the reason for it, heck, they didn't even announce they were going to use it in the first place. My guess it was an experiment.
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Some 5 years ago a story like this was featured on BBC's Tomorrow's World show. They basically meant it to be used by sirens of ambulances and fire engines. The sound they demonstrated (and used on the road) was the same siren sound, but at certain intervals interleaved with plain static (the chush-chush I s'pose).
I hadn't heard anything about that for a while, but a few months after that I heard an ambulance on the road around here (Belgium) and it clearly used the interleaved static, and it DID make the sound source much more easy to be found. However, I only heard them use it twice, and not an ambulance after that has used the sound since. Don't know the reason for it, heck, they didn't even announce they were going to use it in the first place. My guess it was an experiment.
yeah, you're quite right. Buffy does seem to help a lot :) (perhaps that's the reason I have this huge poster of her behind my computer :) ).