2005 State of Mobility Report - City of Bellevue

CHAPTER 6: Neighborhood Programs and Services
excessive speeds on local streets. The radar signs
display the speed of a passing vehicle compared to
the actual speed limit, encouraging drivers to adjust
their speed if needed.
In 2005, Neighborhood Services staff reviewed the
20 locations where permanent radar signs have been
installed during the past five years (See Map 6-E
for radar sign locations). A report documented the
results and three major findings:
• Stationary Radar Signs, when used appropriately,
reduced vehicle speeds between 2 and 5 mph
(between 8 and 20 percent);
• Locations that have had the signs installed for
4-5 years were still experiencing speed reductions;
and
• The highest rate of success has been at locations
where the pre-installation 85th percentile speeds
were at least 10 mph higher than the posted
speed limit.
Chart 6-H details the success of the radar sign
installations as measured by the reduction of
average speeds at the locations. Seven additional
locations were reviewed in 2005, with five
proceeding to final design. Installation of the
technology at these sites will occur in 2006.
Expectations For The Future
For more than 20 years, Transportation’s
Neighborhood Services programs have been
effective in addressing neighborhood traffic
concerns. Through systematic evaluation and
project selection, many of the community’s requests
have been met. However, solutions implementing
simple measures, such as speed humps, are quickly
ceasing to be the norm. With each passing year,
the scale and scope of projects developed through
Transportation Neighborhood Programs have
grown to address increasingly complex issues on
residential streets.
6-H. Radar Sign Effectiveness
6
5
After 1 Year
After 2 Years
Reduction in Speeds, mph
4
3
2
1
0
MPH1 MPH2 MPH3 MPH4 MPH5 MPH6 3M1 3M2
3M3
3M4 3M15 3M6 3M7 3M8 3M9 3M10 3M11 3M12 3M13 VCALM1
-1
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2005 State of Mobility Report Chapter 6