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According to Hart, the billboards are constructed from GE Lexan EXL semi-transparent resin - a material that creates the blur (and thus the illusion of speed) as you look through it. It also works in all conditions regardless of day / night, weather or season]]>http://www.plime.com/plime-com/l/26922/1/http://www.plime.com/plime-com/l/19939/1/http://www.plime.com/plime-com/l/27270/1/http://www.plime.com/plime-com/l/33189/1/http://www.plime.com/plime-com/l/98940/1/http://www.plime.com/plime-com/l/222/1/http://www.plime.com/technology/l/12984/1/http://www.plime.com/plime-com/l/350/1/http://www.plime.com/plime-com/l/418/1/http://www.plime.com/plime-com/l/6755/1/http://www.plime.com/plime-com/l/4066/1/http://www.plime.com/plime-com/l/8201/1/http://www.plime.com/plime-com/l/4105/1/http://www.plime.com/plime-com/l/8238/1/http://www.plime.com/plime-com/l/106267/1/http://www.plime.com/entertainment/l/38058/1/http://www.plime.com/plime-com/l/4128/1/