The Traffic Accident Reconstruction Origin -ARnews-

Re: Coefficient of Friction

Anya (atascill@ford.com)
Tue, 26 Aug 1997 12:31:44 -0400 (EDT)

Whatever you do, make sure you also test brick with dew and/
or rain on the surface also. Brick loses friction very
fast with any kind of moisture. It is downright
dangerous with ice. I grew up with brick streets near my
hometown area hospital (convenient). The real fun
mix is brick coming back through blacktop as brick
"potholes."

Another factor is brick-to-brick planarity. The unevenness
of bricks gives a tire better traction. A well worn brick
will perform differently. Keep in mind that different
colors of brick have different hardnesses, and textures, too.
Orange brick from Ohio may not be as hard as dark red brick from
Michigan or white brick from parts elsewhere. I lived in an
older house with several different colors of brick, and each
handled weathering differently.

The only thing I don't actually have is numbers. From
experience, I prefer driving on a dry brick road,
next a dry blacktop road, and then a level wet blacktop
road. If the blacktop road could have oily film due
to a rain after a long dry spell, I might actually
prefer a wet uneven-brick road on a downhill, oppositely
banked curve. Both are a bad situation.

Anya
atascill@ford.com

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