> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Alan B. Pearce
> Sent: Thursday, March 02, 2006 6:10 AM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] LEDs as lighting
> 
> >>I have serious doubts that it does. After all a filament bulb
> >>is essentially instant on anyway, it must take all of 100 mS
> >>to reach full brightness, and fade again
> >
> >One argument would be that at 70mph you travel a bit
> >over 3 meters in 100ms, which is about one car length...
> 
> To which my response would be - how many car lengths would you travel
in
> the
> human response time ?? It sort of swamps that ...

Wouldn't it really just add to that?  

The faster you get a signal the sooner you can respond to it - even if
the faster signal reception is much smaller in magnitude than the actual
human response time and then braking time.  I know I've had cases where
a mere three meters longer on a stop would be the difference between
contact and no contact with an object.

> I seem to remember as a youngster road safety advertising that
recommended
> a
> car length per 10mph as a minimum safe following distance, which
seemed to
> be reasonable for the cars and conditions of the day. Trouble is
people
> seem
> to think that cars have improved to the point where this is no longer
> needed, despite the additional distractions of radios, cell phones and
so
> on.

This is very true.  Way too many people think they can stop faster than
their cars actually can.



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