Great video regarding artificially low speed limits as revenue generation and not for safety. While focused on issues facing Canada, virtually all of the points raised are applicable to the US. In the video, he states his two key points as: 1) The roads are safest when everyone is traveling at the same speed and in the same direction and paying attention 2) The majority of motorists drive at a speed they consider reasonable, and safe for road, traffic and environmental condition. Posted limits which are set higher or lower than dictated by roadway and traffic conditions are ignored by the majority of motorists. He even cites a study that shows raising speed limits actually lowered traffic accidents.
The lower speed limits create unsafe conditions by causing cars to pass on the right and drive too closely together. Governments and insurance companies make money from low speed limits and have come to depend on that income. I especially like his last statement "Speed still kills your pocketbook because the government ignored the best scientific advice the were given after spending piles of your tax money to get it.
If you enjoy this video and agree with the message, I'd also recommend checking out the book "Traffic: Why We Drive the Way We Do (and What It Says About Us)"
In the mean time, I'd recommend a good radar detector and possible laser jammers.