Interstate 270 forms the majority of the beltway around St. Louis. Starting at Interstate 55 on the southside of the metro area, around the westside to the Mississippi River at Chain of Rocks on the northside. While in the State of Missouri, I-270 is not multi-plexed. Interstate 270 has what MoDOT and the Missouri Highway Patrol call a "Accident Reduction Site". On the first picture (below), notice the warning of heavy traffic. The second picture (below), indicated that crossing the Double White Line is prohibited. Missouri Highway Patrol does monitor and enforce that strictly.
A sign warning motorists. NB I-270 south of I-70. Traffic heading to I-70 can not re enter NB I-270 traffic.
The two mile BGS on NB I-270. A BGS on NB I-270 near I-70. EB I-270 at I-170. Info on I-270's Parent Route. The Mississippi River Bridge of I-270. Picture from the Chain of Rocks Bridge. EB I-270 crossing the Mississippi River. EB I-270 on the Missouri side of the Mississippi River. WB I-270 near Ferguson. NB I-270 in Bridgeton. A junction marker on WB MO St Rt 180. A advisory BGS on EB I-70 in St. Charles County. A BGS on EB MO St Rt 364. NOTE: The control cities. Tulsa is a control city for I-44 and U.S. Rt. 50. Memphis is the control city for I-55. A BGS on NB I-270. A sign on EB I-44 indicating how to by-pass the Metro-Area. Northbound I-270 about a mile south of I-44. NB I-270 near Fenton. The western end marker for I-255. The southern end of I-270. Southbound I-270 near I-55 in South County indicating the end of I-270 and the route number change to I-255
