Human perception and response time can be low, around 20mS would not be
uncommon, though this depends on how far you have to move your foot to
the brake pedal. Most of us don't drive with our leg clenched over the
brake pedal.

Whatever the reason, I react quicker to LED lights. They seem both
brighter and instant on. I think the instant-on part is what really gets
my attention.
--
Martin K


Alan B. Pearce wrote:

>>>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 ...
>
>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.
>
>  
>


-- 
Martin Klingensmith
http://wwia.org/
http://nnytech.net/

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