any info on bikable "sand-seal" shoulder surface (NC) - Page 3

06-30-2004, 09:32 AM

Wayne Pein <[Only registered and activated users can see links. ].com> wrote in message news:<CrgEc.72521$[Only registered and activated users can see links. ] .com>...
> dan baker wrote:
> > [Only registered and activated users can see links. ] (dan baker) wrote in message
> >
> >>anybody have any other examples, specs, or feedback on a
> >>"dirt-colored" shoulder that could be installed adjacent to a
> >>"regular" asphalt traffic lane without affecting drainage or creating
> >>an unbikable grade separation?
> >>......
> I personally would strongly argue against them though. NMDOT is trying
> to save money at bicyclists' expense. Any shoulder where bicycle travel
> is expected/encouraged should be the same pavement quality as the
> standard lane. I can't imagine that a sand sealed surface wouldn't be
> worse, and eventually result in sand coming loose and being slippery.
> And why would they think that bicyclists need extra traction beyond a
> normal ashpalt? Sounds like they are rationalizing cheap pavement to me.
> Wayne
> [Only registered and activated users can see links. ]
-----------------------------------------

actually, they are not trying to take the cheapest way out (this
time). they are even willing to spend slightly MORE that "regular" OFC
asphalt for the shoulders, if they can specify a solution that meets
criteria.

To the credit of NMDOT, they have been working with me to make sure
the surface IS bikable (smooth, not loose, and high-friction) before
they install it willy nilly. They are attempting to balance the desire
and demand from us bikers to have a shoulder, with the hue and cry
from semi-rural residents and historical committees who voice the
desire to stick with 20' wide roads with NO shoulders to minimize
"visual impact" and cost.

Some tech specs I have been able to dig up indicate that there are
specific types of "sand seal" that involve closely controlled
application of an even layer of emulsified asphalt, followed by even
application of a fine (#2, #4) blotting sand, followed by rolling and
sweeping. I just haven't been able to find anybody who actually does
it, or can vouch for the results.

If I can find some physical examples, and a couple testimonials for or
against, I would like to be able to hand this info to the NMDOT to
assist in a decision as soon as possible so we can get a couple big
construction projects finished up.

d