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In 4th Quarter 2007, several homeowners in the
Henderson Road area commented about private and county vehicles traveling
through neighborhoods off Henderson Road and especially along Henderson Road
above the posted speed limit. I contacted the DeKalb County Police
Department's Traffic Specialist Unit and requested a traffic trailer.
I learned the Unit has 2-3 trailers available for the county, and an officer
from the Unit visits the
location to assess need and placement.
In February 2008, a trailer was placed at Henderson
Court/Henderson Road. Computer issues prevented the
department from retrieving data, and as a result, a good unit was sent out
again to Henderson Road.
In March, you may have noticed the trailer at the Arbor
Springs subdivision entrance. Once this trailer was back to the
department, the location
data files were downloaded. The traffic survey report from Henderson
Road in the
attached PDF file (multiple pages and charts) gives a detailed breakdown of the data.
The
survey occurred from 03-22-08 through 03-26-08 (approx 10am).
The survey measured 8,843 vehicles.
Minimum Speed: 11 mph
Maximum Speed: 69 mph
Average Speed: 36.88 mph
" ... The 50th percentile means 50% of the cars were
travelling >37 mph (and 50% <37)....and the 85th percentile means 85%
were travelling <45 mph while only 15% were travelling >45 mph.
Keep in mind that current law governing the use of
speed detection devices for enforcement purposes prevent us from writing
speeding tickets unless a driver operates 11 or more mph above the
posted limit. In the case of Henderson Road, 46 mph or more."
Special thanks to Sergeant Byers with the Traffic
Specialist Unit, and Center Precinct Assistant Commander, Captain Higdon
for scheduling the trailer, responding to any questions I had, and
for sharing this informative report.
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