The logic of this argument couldn't be more perfect. This is too nuts even for characters like you two. The proof of this argument lies in a Department of Transportation study performed at the expense of the American taxpayer. As reported in Motorcyclist magazine, the DOT performed a simple study of the influence of posted speed limits on real-world behavior. Simply that there is little correlation between the posted limit and how fast people drive.
People drive at the speed they feel most comfortable.
During the study DOT measured actual speeds on a stretch of road. Then they raised, lowered and finally removed the speed limit signs all together. All speed limits, at least on the interstates should be removed. Police officers currently being used for traffic enforcement should be reassigned to more useful tasks. Arresting criminals would be a good start.