[Talk-us] surface=chipseal vs surface=asphalt

Joseph Eisenberg joseph.eisenberg at gmail.com
Sun Jan 24 21:34:45 UTC 2021


> How do you tell old chipseal from old asphalt?

I find this to be difficult as well. Chipseal is formed by applying liquid
hot asphalt sealer, then adding a layer of fine gravel. This makes a rough
surface which provides better traction for some vehicles especially in
winter conditions, and the layer of hot asphalt helps seal any cracks in
the underlying original asphalt surface.

But after a few years later there is no clear difference between a road
which is an old, eroded asphalt, versus an old layer of chipseal.

While this sort of makes sense as a value of surface=*, I probably will
stick to using surface=asphalt myself, and add a smoothness=* tag if
possible (though that is also hard to maintain and somewhat debatable)

-- Joseph Eisenberg

On Sun, Jan 24, 2021 at 1:13 PM Mark Wagner <mark+osm at carnildo.com> wrote:

> On Sat, 23 Jan 2021 19:20:35 -0500
> Richard Welty <rwelty at averillpark.net> wrote:
>
> > On 1/23/21 5:48 PM, Chuck Sanders wrote:
> > > Chipseal, asphalt, and concrete are three very different paving
> > > materials, with very different characteristics and behavior.
> > >
> > > From a road engineering perspective, being able to query our
> > > inventory database for exactly how much of each we have in a given
> > > area is absolutely critical.
> >
> > > On Sat, Jan 23, 2021, 11:52 Mateusz Konieczny via Talk-us
> > > <talk-us at openstreetmap.org <mailto:talk-us at openstreetmap.org>>
> > > wrote:
> >
> > >     Is it something considered as substantially different from
> > > regular asphalt concrete?
> > >
> > >     Is surface=chipseal valid value or pointless duplicate of
> > >     surface=asphalt?
> > >
> >
> > i agree with Chuck. the town road in front of my house is chipseal,
> > not asphalt. they are distinctly different and not hard to tell apart
> > once you know what to look for.
> >
> > riding a bicycle on fresh asphalt can be quite nice. riding a bicycle
> > on fresh chipseal is literally riding on a layer of fresh gravel
> > that's been dumped on top of fresh sealer. i avoid it.
>
> How do you tell old chipseal from old asphalt?  There's a road near me
> that the county maintenance department says was chipsealed five years
> ago.  I haven't tried bicycling on it, but as a driver and pedestrian,
> I can't tell it from any other paved road of similar age.
>
> --
> Mark
>
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