Interstate 244 was the former designation for the 20.0 mile long section of Interstate 270 (Circumferential Expressway) between I-55 and I-70. Designated in 1958 and completed in 1967,1 I-244 was renumbered as Interstate 270 in 1974 due to motorist confusion.2 The American Association of State Highway and Transportation Officials (AASHTO) approved both the renumbering of I-244, and I-255 east from Mehlville into Illinois as I-270 on June 25, 1974:
I-244, I-255 and I-270 comprise essentially one continuous route which encircles the St. Louis Urban Area. The present points of change in route designation are confusing and seem pointless to motorists since no apparent change in direction occurs. Providing one route designation (I-270) will eliminate this problem and be in keeping with the principal of route continuity.