[Talk-us] Road classification

Scott Atwood scott.roy.atwood at gmail.com
Tue Dec 16 20:05:07 GMT 2008


On Tue, Dec 16, 2008 at 11:44 AM, Chris Lawrence <lordsutch at gmail.com>wrote:

> - highway=trunk.  Referred to in many states as an "expressway."  A
> highway typically with limited access by adjoining property owners,
> but access via both at-grade intersections and grade-separated
> interchanges.  Systems like the Mississippi Four-Lane Highway Program
> are often constructed to these standards (so routes like US 61 and US
> 82 in Mississippi qualify).  Should not be used for routes with
> frequent traffic control devices (signals, four-way stops, etc.)
> although an occasional traffic signal would not disqualify a route.
> To borrow from Russ' example, parts of US 17 in southern New York that
> haven't yet been fully upgraded to I-86 would be "highway=trunk,"
> while sections with exclusively interchange access would be
> "highway=motorway."  See also US 101 between San Jose and Santa
> Barbara, CA, which is a mix of "expressway" and "freeway" segments.
> Most commercial maps show this distinction fairly well.


For those familiar with the Santa Clara County Expressway system, most of
this system would seem to fit well as highway=trunk in your classification
scheme.   Most of these roads fall someplace in between a freeway and an
arterial.  The roads are all divided highways with at least two lanes in
each direction.  Most intersections are at-grade but some are
grade-separated.  Most access is via intersections, with some limited cases
where there is access from adjoining property owners.  There generally only
intersections with freeways, other expressways, and major arterials.
 Pedestrians are generally prohibited, but cyclists are permitted.

-Scott
-- 
Scott Atwood

Cycle tracks will abound in Utopia.  ~H.G. Wells
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