Tensar is giving away a $500 Amazon gift card as part of their SpectraPave Design software challenge. All you have to do is download the free software for design of geogrid subgrade improvement beneath pavements, watch the tutorial video and take a quiz. Then, Bam! You are entered into the giveaway drawing. You might want to check the rest of their rules though. Oh, and the contest ends on March 31, so don’t wait!