i don't know about speed, i'm apt to say older, slower drivers...i'm zooming down the road...keeping pace with the other vehicles, and some old person seems to decide to pull out in front of me...even though there are no cars for miles behind me...

fortunately i notice because they never do...
i drive fast, and have never had an accident...i think once a person reaches retirement age, they should have a yearly driving test...and i mean where they actually drive with an instructor in the car...i've seen too many that could have killed me...if i wasn't quick enough.
the most devastating i've seen was an old man driving a big diesel duelly, one of those big white pick-up trucks...it was foggy and he didn't realize all the traffic had stopped...i look to the side noticing movement, and a mini van two cars behind me that i'd recently passed came skidding to a stop, hitting the corner of the car behind me...
old people should be regulated and restricted when driving...they lose the abilities that make a good driver...