Variable Speed Limits
Missouri concluded a two-year experiment with variable speed limits along I-270 around St. Louis. Digital signs had been erected along the freeway as well as additional signs alerting drivers about the use of variable speed limits. The limits will vary between 40 and 60 miles per hour, depending on traffic conditions, and could change by up to 5 mph every 5 minutes. These speed limits, as of January 2012, are now posted as "Advisory Speed Limits".
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 55MPH on those roads within the St. Louis County and City. Though I-64 construction has been completed, the extra lanes will not be removed until spring through fall of 2010, and therefore the speed limit will remain 55 MPH on I-70/I-44. In October 2010, the speed limit was restored to 60 MPH on both I-44 and I-70.
Read more about this topic: Speed Limits In The United States, Jurisdictional Distinctions, Missouri
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