[Talk-us] Speed limit editing in Detroit

Mark Wagner mark+osm at carnildo.com
Fri May 5 19:07:02 UTC 2017


On Fri, 5 May 2017 12:55:55 +0000
Horea Meleg <horea.meleg at telenav.com> wrote:

> Hello all,,
> Me and my Telenav colleagues are planning to start editing speed
> limit in Detroit area and we found the following situation:
> 
>   1.  There's a trunk road which continues with a motorway but we
> don't have a speed limit sign at the beginning of the motorway. Do
> you think we should add the speed limit value from position 1 or 2 on
> the highlighted segment? 42.4985931, -83.3042949 --> Position 1 (50
> mph) 42.4941433, -83.2950564 --> Position 2 (70 mph)

The speed limit from (1) should be used.  A change of road
classification doesn't automatically imply a change in speed limit.
 
>   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? Thank
> you, Horea Meleg

In general, motorway_links to a motorway are treated by everyone
(drivers, police, courts) as having speed limits equal to the speed
limit of the motorway they provide access to.  Links from a motorway
are treated as a "transition zone" where you are expected to be going
the motorway's speed limit at the start of the link, and the
destination road's speed limit at the end.  Advisory speed limit signs
are common, while signed mandatory limits are extremely rare.

-- 
Mark



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