Maryland, Missouri and Ohio with I-270 in the highest... That’s 3/4 the I-270 variants! Interesting seeing it 3 times on the list, as someone that lived in StL and Cbus in the past, and visited DC a couple of times. For the mile markers, 14 for STL’s 270 makes sense, as a lot of drivers use that part of I-270 to change from I-64 (exit 12) to MO 364 (exit 16) or I-70 (exit 20). 33 for Columbus’s I-270 is different from my guess, which is 23 (the stretch between OH 315 and I-71), but I guess New Albany developed to a point that part of I-270 to change from OH 161 to I-670 is much more used, also the Easton Mall’s exit is 33. A project that added C/D lanes between I-670 and Easton also finished last year in that area.