Today In History: Nixon Signs 55 MPH National Speed Limit Into Law

The double nickel.  Fifty five miles per hour.  From this day in 1974 until 1987, the national maximum speed limit was set by law at 55 miles per hour.  States were free to set their own speed limits above 55, of course, but doing so would have forfeited federal highway funds.  None did, but Nevada, but that state’s brief flirtation with a 70 MPH limit ended when highway funds were pulled, and the limit automatically reverted to 55 MPH as a reaction to that.  Money talks, after all.

Though its intent was to save fuel, in response to the 1973 Arab oil embargo, it didn’t perform nearly as well as it was intended to.  At the time of its passage, government officials estimated that it would reduce fuel consumption by 2.2% vs. pre-limit levels.  In reality, fuel consumption fell by between just 0.5% and 1.1%, depending on who was counting.  (The government said 1.1%, and an independent study said 0.5%).

What the double nickel did do, though was frustrate and annoy a generation of motorists – and state officials charged with its enforcement.  Gone was the previous notion that speed limits should be set at the 85th percentile of prevailing traffic; many of the roads suddenly shackled by 55 MPH speed limits were designed to handle much faster traffic.

Several states adopted creative ways of ignoring the lower speed limits imposed upon them.  Per the ever-reliable Wikipedia,

  • Arizona, Idaho, Montana, Nevada, and Utah replaced traditional speeding fines with $5–$15 energy wasting fines as long as drivers did not exceed the speed limit in effect before the 55 mph federal requirement.
    • Nevada’s energy wasting fine was enacted on April 15, 1981, when signed by Governor Robert List. Motorists not exceeding 70 mph (110 km/h) in 55 mph (89 km/h) zones could be issued $5 “energy wasting” fines. However, standard speeding tickets were still allowed and “troopers were directed not to take the new law as a signal to stop writing tickets.”
  • In 1986, North Dakota’s fine for speeding up to 15 mph (24 km/h) over the limit was only $15 and had no license points.
  • South Dakota cut speeding fines in 1985 and stopped assessing points for being 10 mph (16 km/h) or less above the speed limit in 1986.
  • August 1, 1986, Minnesota, which normally suspended licenses after three tickets, stopped counting speeding tickets for no more than 65 mph (105 km/h).

Eventually, with oil again cheap and increased demand for higher speed limits, Congress acted in 1987 to raise the national speed limit to 65 MPH on rural interstate highways.  In late 1995, Congress finally completely repealed the concept of a national speed limit with the National Highway Designation Act.  Shortly after the act becoming law, several states raised their speed limits above 65 MPH.

I still remember the first time I legally drove 65 MPH – it was in June 1993 on a stretch I-66 in Virginia shortly after my high school graduation.  Freedom!  Though Autosavant’s home state of Pennsylvania has speed limits that are capped at 65 MPH, we’ve enjoyed a few legal blasts to 70 and 75 when traveling elsewhere in the U.S.

One interesting footnote of the 55 MPH era was the mandate that all speedometers max out at 85 MPH, and 55 be highlighted.  Not that you’d want to go more than 85 in most Malaise-era cars anyway, but it was a ridiculous regulatory intrusion that made no sense.  I remember poring over Corvette parts catalogs in the 1980s and being amused by how easily the factory 85 MPH speedo could be replaced by a bolt-in unit that hit the peg at 165 instead (yeah, as if a 180-horsepower C3 could hit a buck sixty five).  An acquaintance of mine once reported that his old man’s mid-80s Buick Riviera with full digital dash would just flash “85! 85! 85!” when exceeding that speed, despite having the extra 1 for the hundreds digit.  Kilometers, ya know, necessitated the extra digit.

Now, if we could just do something about these remaining 55 MPH roads…

Source:  History

Author: Chris Haak

Chris is Autosavant's Managing Editor. He has a lifelong love of everything automotive, having grown up as the son of a car dealer. A married father of two sons, Chris is also in the process of indoctrinating them into the world of cars and trucks.

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  1. Yes, unfortunately some limits have never been brought back to where they were before 1974. The limits on 2 lane roads in far NW Minnesota are stuck at 55 (the daytime limit was 65 prior to the imposition of federal speed limits). Ironically, gravel roads are posted at 55 mph like the paved roads. This is probably due to the paved roads being lowered and never raised again. The roads could easily handle 65 mph now (and perhaps 70 given that they were 65 mph 40 years ago), but they realize this is a tremendous cash cow. We now have a “de-facto” speed limit, where some troopers will let drivers go as fast as 65, but there is at least one who will nail anyone for as little as 1 mph over the absurdly under-posted limit. That limit is somewhere between the 5th and 10th percentile speed of free flowing traffic. It’s no wonder I drive in Minnesota as little as possible and why many of my friends in Winnipeg will drive to Grand Forks, ND but refuse to drive in Minnesota (to places like Thief River Falls). The cash cow is actually costing NW Minnesota communities, but it makes money for the state.

  2. On some 2 lane Highways in Western Minnesota, the Speed Limit went from 55 to 60.
    But, ridiculous around the Twin Cities, still 55 mph, its suppose to be 45 mph on I-35 E near downtown St Paul, due to a few whining residents, I’ve seen Troopers and St Paul Cops Patrolling and giving maybe 5 over before a Citation is possible, meanwhile freaks speeding and never getting caught, I don’t mean 5 over at 50, I mean like 70 in a 45, which is differently a Speeding Ticket, sticking on your License for 5 years, and Insurance for 3-5 years,

  3. Geesh, I had no idea there used to be a national speed limit. Talk about overreaching government policy. They say it was to “conserve fuel”, but as you can see that was a lie since it did almost nothing to that end, so I wonder what the real reason was.

    Why would they need to implement this sort of policy to conserve fuel anyway? If fuel were becoming more scarce, the price would rise and people would naturally want to conserve fuel on their own in order to reduce their fuel expense. We don’t need a government policy for EVERYTHING.


  1. Today in History: Nixon signs 55 MPH speed limit - [...] Arab oil embargo, but much criticized, who  has frustrated and annoyed a generation of motorists. Read the story of …

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