On 9/30/10 8:36 AM, Nathan Edgars II wrote:
On Thu, Sep 30, 2010 at 8:15 AM, Richard Welty<rwe...@averillpark.net> wrote:
On 9/30/10 7:38 AM, Colin Smale wrote:
Also important for routing systems is the "practical speed" for a road.
Many country roads may have a high legal limit, but for reasons including
width and curviness you may never achieve anywhere near that in practice.
i have at times wanted this, when i've seen a road that was defaulted to
55mph
but wasn't practical to travel at more than 40 due to broken pavement, for
example.
For curves the government uses a "ball bank indicator" to measure the
safe speed (which then goes on advisory speed limit signs). But I
don't know of any defined method of giving a comfortable speed for
rough pavement. There are some brick roads around here than are hell
at any speed (especially on a bike, despite being signed bike
routes...).
yes, it'd have to be a judgment call on the part of the mapper, and
so is likely to be terribly inconsistent. that's one reason why although
i've thought about it, i've not proposed it here. drivers have different
skills/training, and cars have widely varying capabilities, so notions
about what the maximum reasonable speed have the potential to
vary widely.
richard
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