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elSicomoro · 06-02-2003, 08:45 PM

The daytime speed limit on interstate highways in MT used to be "reasonable and prudent." That was changed to 75 in 1999. (Source)

10 states have a 75mph max: AZ, CO, ID, MT, NE, NV, NM, SD, UT, and WY. 18 other states have 70mph limits, including my native Missouri. Every other state is 65, except for Hawaii (55mph). (Rand McNally 2002 atlas)

Missouri uses a graded system. I'm not sure how it is in KC, but in St. Louis, most of the interstates are 60, except for near downtown, where they are 55. 70 out in the country. Other limited-access highways vary, from 55 to 70.

I don't see interstates with a speed limit less than 55 too often, but they're out there. The Vine St. Expwy. (I-676) here in Philadelphia is one (50mph). The JFX in Baltimore City (I-83) is another (50mph).

06-02-2003, 08:45 PM	#13
elSicomoro Person who doesn't update the user title Join Date: Jan 2001 Posts: 12,486	The daytime speed limit on interstate highways in MT used to be "reasonable and prudent." That was changed to 75 in 1999. (Source) 10 states have a 75mph max: AZ, CO, ID, MT, NE, NV, NM, SD, UT, and WY. 18 other states have 70mph limits, including my native Missouri. Every other state is 65, except for Hawaii (55mph). (Rand McNally 2002 atlas) Missouri uses a graded system. I'm not sure how it is in KC, but in St. Louis, most of the interstates are 60, except for near downtown, where they are 55. 70 out in the country. Other limited-access highways vary, from 55 to 70. I don't see interstates with a speed limit less than 55 too often, but they're out there. The Vine St. Expwy. (I-676) here in Philadelphia is one (50mph). The JFX in Baltimore City (I-83) is another (50mph).