When did they change the speed limit to 55?
No context provided
When did the United States change the speed limit to 55?
January 2, 1974
During the closure and major rebuild of I-64 in St. Louis, an additional lane was added to I-44 and I-70, and the speed limit was thus reduced to 55 mph on those roads within the St. Louis County and City. The I-64 construction has been completed, and the extra lanes were removed in 2010. In October 2010, the speed limit was restored to 60 mph on both I-44 and I-70.
When did St. Louis change the speed limit to 55?
rebuild of I-64 During the closure and major rebuild of I-64
Speed limits in the United States by jurisdiction
No context provided
When did the San Ildefonso-Pojoaque stretch change the speed limit to 55?
2007
In 1995, the state raised the speed limit on rural stretches of Interstate Highways and the Pennsylvania Turnpike system to 65 mph (105 km/h), with urban areas having a 55 mph (89 km/h) limit. In 1997, PennDOT raised the speed limit on some rural non-Interstate Highway bypasses to 65 mph (105 km/h). In 2005, with the change in the designation of "urban zones" in the state, the entire lengths of both the Pennsylvania Turnpike's east–west mainline and Northeast Extension were given 65 mph (105 km/h) limits, except at the tunnels and through the winding 5.5 mile (9 km) eastern approach to the Allegheny Mountain Tunnel.
When did US 84/285 change the speed limit to 55?
2005
Speed limits in the United States by jurisdiction
Previously, the entire US 220 alignment from NC 68 to the Virginia state line was 60 mph but went back to 55 mph between NC 68 and NC 704. 
When did the entire US 220 alignment from NC 68 to the Virginia state line change the speed limit to 55?
between NC 68 and NC 704
Speed limits in the United States by jurisdiction
In the 2000s, all of the major cities in Tennessee except for Nashville and Clarksville petitioned TDOT to enact environmental speed limits in their respective counties after failing to meet EPA air quality standards, reducing speed limits from 70 mph to 65 mph and 55 mph for trucks. Knox County (Knoxville) also petitioned the state to enact these speed limits in all of the neighboring counties of the Knoxville Metropolitan Area, as well as Jefferson County. These moves were controversial, as people believed the actual purpose was to increase revenue from speeding tickets, and the Tennessee Highway Patrol (THP) reportedly started enforcing these as 70 mph zones in the Knoxville area after multiple truckers successfully won court cases and had their tickets dismissed. In 2018, these split speed limits on I-75 and I-40 in Roane and Loudon counties southwest of Knoxville were increased back to 70. On February 19, 2019, 70 mph speed limit signs were installed on I-40 and I-81 east of Knox County starting at exit 398, and in October of 2019, the last of these split speed limits were increased to 70 mph on I-40 east of Knoxville and to 65 mph east of Knoxville with no separate restrictions for trucks. In Nashville, speed limits for freeways are posted at 55 mph at the center of the city, and 65 and 70 mph beyond, with no separate restrictions for trucks. I-26 and I-81 in Kingsport, Bristol, and Johnson City continue with the staggered limits.
When did Tennessee change the speed limit for trucks to 55?
In the 2000s 2000s
Speed limits in the United States by jurisdiction
Speed limits in the United States by jurisdiction
https://en.wikipedia.org/wiki/Speed%20limits%20in%20the%20United%20States%20by%20jurisdiction
Speed limit
https://en.wikipedia.org/wiki/Speed%20limit
Speed limits by country
https://en.wikipedia.org/wiki/Speed%20limits%20by%20country
In November 2005, the stretch between NM-4 and Pojoaque became a safety corridor. In 2007, the speed limit on the San Ildefonso-Pojoaque stretch was lowered to 55 mph.
Speed limits in the United States by jurisdiction
In the 2000s, the major cities of Memphis, Knoxville and Chattanooga petitioned TDOT to enact environmental speed limits in their respective counties after failing to meet EPA air quality standards, reducing speed limits from 70 mph to 65 mph and 55 mph for trucks.
Speed limits in the United States by jurisdiction
The National Maximum Speed Limit (NMSL) was a provision of the federal government of the United States 1974 Emergency Highway Energy Conservation Act that effectively prohibited speed limits higher than 55 miles per hour (89 km/h). It was drafted in response to oil price spikes and supply disruptions during the 1973 oil crisis and remained the law until 1995.
National Maximum Speed Law
The Emergency Highway Energy Conservation Act[14] was a bill in the U.S. Congress that included the National Maximum Speed Limit.[15] States had to agree to the limit if they desired to receive federal funding for highway repair. The uniform speed limit was signed into law by Nixon on January 2, 1974, and became effective 60 days later,[16] by requiring the limit as a condition of each state receiving highway funds, a use of the Commerce Clause of the United States Constitution.[17]
National Maximum Speed Law
The National Maximum Speed Limit (NMSL) was a provision of the federal government of the United States 1974 Emergency Highway Energy Conservation Act that effectively prohibited speed limits higher than 55 miles per hour (89 km/h). The Emergency Highway Energy Conservation Act was a bill in the U.S. Congress that included the National Maximum Speed Limit. States had to agree to the limit if they desired to receive federal funding for highway repair. The uniform speed limit was signed into law by Nixon on January 2, 1974, and became effective 60 days later. During the rebuild of I-64 an additional lane was added to I-44 and I-70 which had a 55 mph limit. Upon completion the limit was restored to 60 mph. In New Mexico the in November 2005, the stretch between NM-4 and Pojoaque became a safety corridor. In 2007, the speed limit on the San Ildefonso-Pojoaque stretch was lowered to 55 mph. US 84/285 speed limit was changed to 55 mph in 2005.  In the 2000s, the major cities of Memphis, Knoxville and Chattanooga Tennessee petitioned TDOT to enact environmental speed limits in their respective counties after failing to meet EPA air quality standards, reducing speed limits from 70 mph to 65 mph and 55 mph for trucks.