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PK is excited to offer 15% off Aervoe collapsible safety cones with LED beacons until March 12, 2012. Just enter the coupon code CONE15 at checkout for instant savings. From a young age, we in the good old US of A are conditioned to think “Caution!” when we see a big orange cone. So important is this knowledge that the Federal Highway Commission published a key book of rules called the  Manual on Uniform Traffic Devices, or MUTCD. Among outlawing such things as blue stop signs and traf …