History
Until the mid-1990s, I-72 ran from Springfield at Interstate 55 to Champaign at Interstate 57. On June 9, 1991, the American Association of State Highway and Transportation Officials (AASHTO) approved the establishment of Interstate 172 from the western terminus of I-72 at Springfield to Fall Creek, 4 miles (6.4 km) east of Hannibal, Missouri, though it was contingent on Federal Highway Administration (FHWA) approval. The FHWA preferred to designate the route I-72.
After discussions regarding extending an Interstate-standard highway through the state of Missouri, on April 22, 1995, AASTHO approved another renumbering. I-172 was renumbered in its entirety as I-72. The U.S. 36 extension west of Fall Creek was also given the I-72 designation. The Illinois Route 336 expressway was renumbered to I-172 from Fall Creek to Fowler.
Prior to September 2000, Mark Twain Avenue (old US 36) was composed of the current Mark Twain Avenue (now Route 79) and the portion of I-72 and US 36 west of Exit 157 to the Hannibal city limits. Route 79 terminated at the foot of the old Mark Twain Memorial Bridge at the corner of Third Street and Mark Twain Avenue. Signs along the four-lane expressway portion of Mark Twain Avenue marked the route as "Future I-72", while signs along what is now Route 79 had I-72 trailblazers to direct drivers to the temporary terminus at Fall Creek, Illinois.
When the new Mark Twain Memorial Bridge was completed in September 2000, I-72 was routed over the new bridge, along with US 36. Route 79 was extended along Mark Twain Avenue to terminate at Exit 157. The portion of I-72 and US 36 west of Exit 157 is now referred to as the V.F.W. Memorial Highway.
Originally, I-72 opened with a posted speed limit of 65 mph (105 km/h). However, when it first opened, some drivers were confused and were driving it at 35 mph (56 km/h), the old posted speed limit on Mark Twain Avenue. Later, Hannibal convinced MoDOT to lower the speed limit along I-72 and US 36 within the Hannibal city limits to 55 mph (89 km/h).
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