Studies show that people give little regard to the speed limit, they drive at a speed they feel comfortable. Putting an artificially low speed limit will cause some people to slow down to 55 while the regular flow of traffic will be going much faster. This creates a speed difference that can be very deadly. In Utah when the interstates went from 75 to 80 but traffic accidents dropped by 11-22% because the median flow of traffic was 82.
No, we should not restore the 55 miles per hour national speed limit. There was never any real proof that it did anything to conserve fuel or save lives. About its only accomplishment was lining the coffers of local governments due to speeding tickets. The current speed limit variations are good.
No, the 55-miles-per-hour national speed limit should not be restored, because freeways are some of the safest roads. The National Highway Traffic Safety Administration studies traffic and statistics, and they have found that traffic is safe on highways traveling at 70 miles per hour. There are benefits to a higher speed limit, including faster response times for emergency vehicles.
There are of course spots along our highways where we need a speed limit of 55 mph, but that is not everywhere. There are long stretches of highways in places where that would be too slow because there is nothing going on. So we need to be wise in planning out highway speeds.
The 55 miles-per-hour national speed limit should not be restored. I think every highway should be able to handle the appropriate speed that the state deems fit for it. Most highways speeds are now set between 70-75 miles-per-hour now-a-days so to go back to the normal 55 miles-per hour would seem ridiculous.
The country is way too big for a one size fits all speed limit. The US has a diverse terrain and landscape. There are areas where the land is flat and sparsely populated and the Interstate allows 65 or more miles per hour. In other areas, two lane winding roads are unsafe over 50 miles per hour. Let's forget about a national speed limit and let the local authorities make that decision.