[Talk-us] Dual carriage way?

[Paul Johnson]

On Sat, May 14, 2016 at 11:13 AM, Eric Ladner <eric.ladner at gmail.com> wrote:

> http://www.openstreetmap.org/#map=16/30.0752/-90.5123
>
> This section of West Airline Hwy was probably imported from Tiger as a
> dual carriage way.
>
> This section is two lanes in either direction with a center turning lane
> for quite a few miles through town (no center divider).
>

With very few exceptions, these should be single carriageway.  Possible
edge cases being wide gaps in a median for multiple driveways, or a flush
median (not sure if New Orleans has this concept, but in most places that
do, the flush median has two longitudinal yellow stripes, and has diagonal
yellow markings guiding you back towards the traffic lanes, such as shown
at
https://api.mapbox.com/v4/pauljohnson.mgkc1bfe/page.html?access_token=pk.eyJ1IjoicGF1bGpvaG5zb24iLCJhIjoiYmYwOGE5OTdmODdhMjBkOTc3NjVjN2Q4ODNlNzBhM2UifQ.GsQqFIeUvV6OuJw2eah8iw#19/35.40648/-97.49242
)


> I've converted a lot of "FIXME" single ways into dual one way highways,
> but I've never converted one back the other way.
>

It's a major pain because of the intersections, for sure.  I've been doing
this piecemeal in Oklahoma City due to the fact almost every street with
more than one lane on a side came from TIGER as a dual carriageway.
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