[Tagging] winter tyres

Volker Schmidt voschix at gmail.com
Wed Nov 1 21:11:06 UTC 2017

In many European countries we have two types of restrictions:
(a) Certain roads or road networks require you to carry winter equipment
for specific periods (details vary widely) or under certain weather
conditions (more or less vaguely defined)
(b) Roads may be closed for predefined or variable times (typically alpine

On 1 Nov 2017 8:55 p.m., "Kevin Kenny" <kevin.b.kenny+osm at gmail.com> wrote:

> On Wed, Nov 1, 2017 at 2:47 PM, Paul Johnson <baloo at ursamundi.org> wrote:
> > Data consumers should at least prompt "do you really want to go with this
> > route?" during the winter on routes that are restricted in winter, and
> > reject on routes closed in winter (or at least throw an "are you sure?"
> on
> > winter road restrictions; after all, they could already be in trouble in
> > conditions where tracking their own path in isn't possible to get back
> out
> > (ie, after a blizzard), and being able to orient to a more reasonable
> > location for rescue might be the best opportunity for rescue if they've
> > already got themselves stranded).  In either way, can't hurt to also warn
> > when approaching the conditional if the exact conditions aren't known to
> the
> > consumer (ie, a wet road speed limit if the consumer can't/doesn't check
> the
> > weather; or a variable speed limit if there's no way that the consumer
> can
> > tell what the real limit is until the sign is seen, or that you're
> > approaching a potential winter restriction or closure in winter so
> decisions
> > can be made (anything from slowing down so a hidden speed bump doesn't
> rip a
> > muffler off to not barreling into a wall of snow where winter maintenance
> > ends).
> In my area, the signage is usually: "Limited purpose seasonal-use
> highway. No maintenance Dec 1-Apr 15." But those dates are very, very
> flexible. I've seen the roads close by Hallowe'en in a year with a
> heavy early snowfall (a light snow, and they'll still try to keep them
> plowed outside the posted dates), or take well into
> May to get them open again if the snowpack
> is high or the rockslides have been bad. Similarly, I've seen them still
> open until Christmas or opened again in late March. So I agree that a
> generic
> "are you sure?" prompt is probably The Right Thing. The mountains
> make their own weather, and we humans aren't very good at
> scheduling around it.
> So I agree that any conditional restriction that a routing&navigation
> system doesn't understand merits an 'are you sure?'. And for that
> reason, in many of these highly fuzzy cases, it doesn't do to get too
> finely into the details. It actually is trying to remove responsibility
> from
> the driver, where it belongs, and place it on the navigation system, which
> generally lacks the information and judgment needed to make the
> right call.
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