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Effects <br />Volumes <br />Speed <br />Traffic Noise and Air <br />Traffic Safety <br />Little or no effect <br />Lower observed speeds when device is present <br />Little or no effect <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 concems 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 />Enforcement <br />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 driver's <br />attention to the posted speed limit. The <br />purpose is to remind drivers that they are <br />speeding to help encourage compliance. <br />APRIL 2005 <br />23 <br />