If you suffer from high blood pressure, you may not want to continue. This is a story about the federal government's response to major safety issues, and some readers may find it frustrating, if not outright alarming.
In March, the Associated Press published the results of a study about the speed ratings of tractor-trailer tires. The researchers reported that most truck tires are built to handle sustained speeds up to 75 mph. The tires were fine as long as state laws stuck to speed limits of 65 or 70 mph. In the last few years, though, 14 states have raised the speed limits on major highways to 75, 80 and even 85 mph.