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| Subject: | [gislist] White Marsh, MD I-95 10/16/04 |
| Date: |
10/25/2004 02:15:01 PM |
| From: |
DickBoyd .. aol.com |
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In a message dated 10/25/2004 11:42:31 AM Pacific Standard Time,
kevin.bell@slcgov.com writes:
What did you find with the series of accidents near White Marsh, MD on
10/16/04?
The southbound section of I-95 is oriented 240-060 in the area of crashes.
Sun azimuth was near 240 degrees and below 20 degrees elevation at the time of
the first crash. Only one crash was on the 060 direction. That was a large
truck. Nearby road had a fatal crash. Storm was rapid moving with bright sunshine
and glare from the road.
There is a story that the first rain of the season results in slipperier
roads. I don't think that is true. I think something else causes a spike in
crashes when the weather changes. Blaming slipperier roads precludes looking for
other causes.
For instance, if it is sun angle, or transition between light and dark,
driver education could emphasize preparation for weather. If a crash was due to a
driver distracted by something falling from behind a sun visor, Dave Letterman
could get people to play "What's Behind Your Visor?" as the icebreaker to
introduce changes in driver behavior. Insurance Companies might even sponsor the
game.
I'm still trying to find out if hydroplaning was involved. Did any of the
tires "revert"? Reversion happens when a hydroplaning wheel makes contact with a
braking surface. Heat generated by the skid boils the water. The steam bubbles
up the tire surface. Heated rubber reverts to an uncured state.
I doubt there was hydroplaning, Only delayed reaction time. Not convinced one
way or the other yet.
The official report may strip away comments on reversion and sun angle.
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