[Tagging] Residential roads

[Nathan Edgars II]

On Thu, Sep 30, 2010 at 8:15 AM, Richard Welty <rwelty at 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...).