IMO, the speed limit is to address the people who suck at driving(whether they are slow or fast drivers)...
AND
to minimize the speed of those that they know will be going faster anyway...
with a speed limit of 55, i bet the city/state expect drivers to average 62. But if they had the limit higher at 60-65, then the average would be 70+. My mom would be driving 52 and she would definitely freak out if she saw cars around her driving at 70+. My dad on the other hand wouldn't care and would drive 62ish
what would the sucky slow driving people do if they saw cars driving 20mph more than what they are used to?
Likewise there are some aggressive drivers who suck at driving and cut off other cars in a dangerous way. If they were told they could go 65 on route 22, they would be going 75.
And the average(when there is minimal traffic when you can actually drive the speed limit) is easily over 7mph....... because when i choose to Cruise, i will put it at 7mph over and everyone passes me.
"
According to a study by the International Bridge, Tunnel and Turnpike Association (IBTTA), the reported average normal driving speed on interstates posted with 55 mph speed limits was nearly 66 mph.
"
given the above per a google search... which i can accept might be incorrect, but aligns with what i experience.... On a Posted 55mph if you are driving 55 and under, then you shouldn't be driving.... likewise if you are 75mph and over, you shouldn't either. if you are at 55-60... stay on the right lane, 60-65 middle lane, 65-75 on the left lane.... And if you see someone coming at you at 8-mph, don't get all offended, move out of the way and let them pass.... if you have a passenger, call the cops if that makes you happy. This coming from someone who does just that as i drive 63-67mph on a 55.
Although i will admit it sucks on a 2 lane highway, because the ones who actually believe it is 55 on a 55 will cause 95% of the drivers to go on the left lane trying to get around that, congesting all traffic.