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How can a speed bump be green? Simple. If it does its job right and rewards low speed driving and punishes speeding, it can reduce gas consumption and exhaust emissions. That's exactly what these new smart speed bumps aim to do. Sprung from the fertile minds of designers Jae-yun Kim and Jong-Su Lee, they use an inner damper to detect vehicle speed and if it is slow enough, the bump flattens. If the car is going too fast it remains upright and does what any good speed bump should. It punishes the

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We happen to know of a housing development in Southern California that recently had its central road repaved. Out went the crumbling asphalt and nasty old speed bumps, and in went shiny new black pavement... and an additional helping of nasty new speed bumps. The paving company had actually doubled the number of bumps, presumably in an attempt to slow down traffic through this residential area. What actually resulted was cars now speeding up even quicker and slowing even faster between the bumps

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When is a speed bump not a speed bump? When it's a faux traffic calming device merely painted on the road. Philadelphia is trotting out "Drive CarePhilly," a program that simultaneously gets a raspberry for its name and its execution. The aim of the effort is to slow down speeding drivers, and one technique involves a tromp l'oeil ruse to make drivers go "What the heck is that?" and slow down. Philadelphia's traffic manager Charles Denny apparently thinks the plastic material laid down at some i

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