Speed display boards are a relatively new speed reduction technique used in Canada. They
\nuse radar technology to display in real-time the speed of oncoming drivers through transition
\nzones to encourage them to slow down to the posted limit. Previous studies have evaluated
\ntheir effectiveness with simple before-and-after analyses for relatively short time periods. This
\npaper evaluates the long-term effectiveness of speed display boards on speed reduction
\nthrough school zones. Traffic speed surveys were performed prior to the installation of speed
\ndisplay boards at two selected school zones as well as one week, two months, one year, and
\nnearly four years after the boards were activated. The intent was to document the \u2018novelty\u2019
\neffect, if any, that would result in diminished effectiveness over time. Results including mean
\nspeeds, 85th percentile speeds and speed variances were analyzed using statistical methods.
\nResults show a sustained and statistically significant reduction in the average speeds ranging
\nfrom 5-14 km\/h dependent mostly on the degree of excessive speeding prior installation but also
\non the location within the school zone. Mean speeds where reduced consistently to a level of
\napproximately 36-37 km\/h (in a 30 km\/h posted zone). The variances in speed observations
\nshowed no statistically significant changes. It was concluded that speed display boards have a
\nstatistically significant long-term effect on reducing motorist speeds through school zones<\/p>\n
<\/div>","protected":false},"excerpt":{"rendered":"
Eric D. Hildebrand, Daniel D. Mason, Denis P. Paradis, Kaitlin E. Hazzard<\/p>\n","protected":false},"author":163,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_post_transparent":"default","_kad_post_title":"default","_kad_post_layout":"default","_kad_post_sidebar_id":"","_kad_post_content_style":"default","_kad_post_vertical_padding":"default","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[128,346],"tags":[],"class_list":["post-18761","post","type-post","status-publish","format-standard","hentry","category-2014-cmrsc-ccmsr-xxiv-vancouver","category-research-and-evaluation"],"acf":[],"_links":{"self":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts\/18761","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/users\/163"}],"replies":[{"embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/comments?post=18761"}],"version-history":[{"count":2,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts\/18761\/revisions"}],"predecessor-version":[{"id":19790,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/posts\/18761\/revisions\/19790"}],"wp:attachment":[{"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/media?parent=18761"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/categories?post=18761"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/carsp.ca\/en\/wp-json\/wp\/v2\/tags?post=18761"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}