Hi Ed, This is something I have thought of before (a long time before mobile phones became popular) but not in this context and with the signal being received by the car rather than sending it. Here in the UK the old, meandering (and I'm talking thousands of years old, here) country lanes are often single track with passing places and have high banks/hedges on each side sometimes as high as 10 feet or more. Needless to say visibility of the road ahead can be as little as 20 feet or so. Relatively slow moving traffic - walkers, cyclists and horse riders - often come into conflict with much faster moving cars, trucks and farm machinery.
I thought about using something similar to assist car drivers in anticipating these hazards. Your plan would be better but I originally considered using the inaudible frequencies naturally generated by vehicles engines and gearboxes which would mean no additional cost to the car owner/maker. I wonder if mobile phones carrier signal could be used instead - longer range than wifi - and most people have one nowadays. A bit OT! MW On 2 Jul 2013, at 16:57, Ed Blackmond wrote: > How about broadcasting a signal at a frequency outside the audible range. > Then sell a device that can pick it up. Legislation could require all > smart phones, ipods and such to pick it up. If the noise signal was > required for all vehicles, then people wearing ear phones, whether blind > or not would get a warning regardless of the type of vehicle. > > Ed > > On Tue, 2 Jul 2013, Peri Hartman wrote: > >> I think we can make more progress by lobbying for an appropriate sound >> rather than trying to fight it altogether. >> >> Personally, I'd like EVS to be as quiet as possible. I can envision a >> future where an intersection will be the quietest point on the road - no >> engines drumming, no tire noise, just a slight whrr when the light turns >> green. Contrast that to what it is now, with loud exhausts and heavy >> vehicles trying to accelerate. Not peaceful, huh?> >> >> Now imagine the same intersection with EVs equipped with noisemakers. If >> they sound anything like backup alerts on trucks, it doesn't take much to >> hear the cacophony of racket. Probably worse than the ICE noise we have >> now. >> >> So, I will by proposing something which could turn into a national >> automotive vehicle alert requirement: >> 1. unique from other road noises (so the blind can recognize it), >> 2. no louder than necessary to hear from 5' away and < 30db. >> 3. nonaggravating to hear; for example a softly pulsing pink noise. >> >> Peri Hartman >> >> >> -----Original Message----- >> From: [email protected] [mailto:[email protected]] On Behalf >> Of Lee Hart >> Sent: 02 July, 2013 7:49 AM >> To: Electric Vehicle Discussion List >> Subject: Re: [EVDL] EVLN: 'Noisy EV' campaign gets backing from the blind >> (video) >> >> Chris Tromley wrote: >>> I continue to wonder why EVs are singled out on this issue. There are >>> plenty of luxury vehicles that are quieter than some EVs. >> >> Because there are groups with an agenda, who stretch whatever >> circumstances come along to support their cause, whether the fact >> justify it or not. :-/ >> >> > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
