[Talk-us] Freeway exit tagging

Paul Johnson baloo at ursamundi.org
Mon Aug 29 20:33:04 UTC 2016


On Mon, Aug 29, 2016 at 2:05 PM, Jack Burke <burkejf3 at gmail.com> wrote:

> > This exit has no turn lane. There is no staging lane prior to the exit
> where tags could be placed, one should not be created just so that there is
> a place to put tags.
> > This freeway should not be split. You said yourself that the exit is not
> part of the freeway itself, so tags should not be placed on the freeway.
>
> That's not entirely true.  The exit ramp technically begins in the middle
> of the far-right travel lane.  If you were to imagine the highway as a
> train track instead, the exit ramp would have to physically connect to the
> rail in the lane.  The same concept applies here, and although I've never
> actually asked one, I'll bet a highway engineer would agree.
>

While not a licensed engineer or planner, my major was civil engineering
and my minor was transportation planning and I'm fairly familiar with the
applicable federal standards.  Without going into semantics, that's
actually a very apt description.  One of my mentors, Sam Baldock, also
tended to take into special consideration on highways he designed that all
movements drivers might reasonably try could be accomplished without having
to make lane changes more frequently than legally allowed.  Essentially,
consider how crossovers are staggered in a railroad yard enforcing
distances between track changes.

I wish Oklahoma did this, I've come across a few places in Tulsa where US
and State highways enter on one side of the roadway and exit on the
opposite side a very short distance later, meaning there's actually no way
to stay on the same route without making at least one illegal lane change
(too close to merge, exit or most recent lane change).
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk-us/attachments/20160829/11057161/attachment.html>


More information about the Talk-us mailing list