Re:Apple Maps vs. Google Maps vs. Waze
by dragonwriter on Thursday February 22, 2018 @04:57PM
(#16441821)
> It’s a standard practice in traffic engineering to set limits based on 85th percentile speed of free flowing traffic in good conditions. That apparently tends to produce an optimal speed limit from a crash/mortality perspective, but has the side effect of criminalizing the conduct of 15 percent of motorists.
No, it doesn't, for several reasons, most notably:
(1) percentiles don't work that way; particularly, if everyone who would drive at or faster than the limit in its absence drove exactly at the limit in its presence, it would have no effect on the 85th percentile speed, so setting and maintaining an 85th percentile limit doesn't require any violations of the limit to occur,
(2) simple speed limit violations often are not criminal in and of themselves, so even if 15% were driving over the limit, they wouldn't be criminals.
No, it doesn't, for several reasons, most notably:
(1) percentiles don't work that way; particularly, if everyone who would drive at or faster than the limit in its absence drove exactly at the limit in its presence, it would have no effect on the 85th percentile speed, so setting and maintaining an 85th percentile limit doesn't require any violations of the limit to occur,
(2) simple speed limit violations often are not criminal in and of themselves, so even if 15% were driving over the limit, they wouldn't be criminals.