[Talk-us] Speed limit editing in Detroit

Paul Johnson baloo at ursamundi.org
Sat May 6 08:11:24 UTC 2017

On Sat, May 6, 2017 at 3:07 AM, Paul Johnson <baloo at ursamundi.org> wrote:

> On Fri, May 5, 2017 at 7:55 AM, Horea Meleg <horea.meleg at telenav.com>
> wrote:
>>    1. A lot of motorway_links don’t have a speed limit sign. Do you have
>>    any idea where could we get the speed limit values from?
>> In North America, ramps with speed limits are relatively rare, but
> following the usual rule that the previous speed limit applies, the speed
> limit of the off-ramp would be the same as the freeway itself unless
> otherwise posted, and if the same ramp returns to the freeway contiguously,
> that speed limit would continue to carry over to the on-ramp.  It's not
> very much more complicated than that, but in practice, just leave off
> maxspeed on the ramps entirely unless it's actually posted with a
> regulatory (white sign) speed limit or a general speed limit is known (both
> relatively uncommon). maxspeed:advisory would be far more common, as exit
> ramps are nearly universally posted with an advised (yellow sign) speed.

Adding to my own answer again, I should say rather than "in practice, just
leave off maxspeed" but rather, "in practice, it never comes up so people
rarely tag it."  I don't mind adding these if folks consider that favorable
(I do see the value).
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