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Enforcement Variable Speed Display Board <br />Purpose <br />A portable speed display board wired to a <br />radar provides passing motorists their <br />travel speed along with the speed limit. The <br />display can help raise driver awareness, <br />encourage compliance, and direct drivers <br />attention to the posted speed limit. The <br />purpose is to remind drivers that they are <br />speeding to help encourage compliance. <br />3O <br />I <br />Effects <br />Volumes <br />Little or no effect <br />Speed <br />Lower observed speeds when device is present <br />Traffic Noise and Air <br />Little or no effect <br />Traffic Safety <br />There is the potential for sudden braking by some motorists <br />Advantages <br />• Portable Display board can be used in various locations enabling residents to <br />borrow and place on their street <br />• Low cost ($2,000 to $11,500 per unit) <br />• Can be used to target timing and location of police enforcement (if data shows <br />excessive speeds at a certain time) <br />Disadvantages <br />• Possible concerns with causing conflict between citizens involved (vigilantism) <br />• May only provide short term effectiveness <br />• Possible vandalism or could encourage aggressive drivers to see how fast they <br />can go <br />• Needs power to function <br />• Requires personnel to move and place unit <br />Problem Targeted <br />• Any location where speeding is a problem or where drivers need to be educated <br />about traffic issues in the area. <br />Design <br />• Variety of types of variable speed display boards available — some include <br />traffic county abilities. <br />APRIL 2005 23 <br />