In response to Kenneth Fink's opposition to the 65 m.p.h. speed limit, I say this: People who drive 65 m.p.h. now do so because that is the speed at which they feel comfortable driving, not because it is 10 m.p.h. above the speed limit.
Saying that people will start driving 75 m.p.h. if the speed limit is raised to 65 m.p.h. because of the "human nature" of people to do such things is ridiculous. Most people would not feel comfortable driving at 75 m.p.h.; instead they will legally be allowed to drive at the speed at which they feel the most comfortable: 65 m.p.h.