Question: When did they change the speed limit to 55?
Disambiguated questions and answers: question: When did the United States change the speed limit to 55?
When did St. Louis change the speed limit to 55?
When did the San Ildefonso-Pojoaque stretch change the speed limit to 55?
When did US 84/285 change the speed limit to 55?
When did the entire US 220 alignment from NC 68 to the Virginia state line change the speed limit to 55?
When did Tennessee change the speed limit for trucks to 55?
answer: January 2, 1974
rebuild of I-64
During the closure and major rebuild of I-64
2007
2005
between NC 68 and NC 704
In the 2000s
2000s
Natural Questions answer: 1974 (from the Wikipedia article "National Maximum Speed Law")