Leon Heller <PICLIST@MITVMA.MIT.EDU> wrote:

> With a square wave, simply sweeping the frequency (incrementing it
> on every cycle) makes it much more "interesting"; some of the
> pedestrian crossings near where I live use this technique,
> presumably to make people walk faster.

Leon:

It's more likely that the sounders are there to inform blind
pedestrians that the traffic light is in their favor.

-Andy

=== Andrew Warren - fastfwd@ix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499