Q: In this task you will be given an answer to a question. You need to generate a question. The answer given should be a correct answer for the generated question.
Mississippi has a minimum speed of 30 mph on four-lane U.S. highways when no hazard exists. Strangely, there is no law for the minimum speed of the state's growing number of four-lane state highways. The minimum is 40 mph on Interstate Highways and on four-lane U.S. designated highways that have a 70 mph speed limit. In 2004, Mississippi posted minimum speed limits (40 mph) on all rural Interstates, but this minimum speed limit was already state law before then.
A:
what are the maximum and minimum speeds on interstates in mississippi