At I-70, I-270 makes a transition from a north–south highway to an east–west highway though not signed as such until McDonnell Road, and will eventually become a six-lane highway by the time it reaches Lindbergh Road. It then meets I-170, which had its interchange rebuilt from 2001–04 during which a left exit lane in the westbound lane was corrected. This section of I-270 was a source of frequent backups during the late-afternoon hours until the interchange was rebuilt. A fatal accident in September 1999 spurred the rebuilding of the interchange although the accident did not occur at that location happening a mile east of the interchange. I-270 then passes various streets where every westbound exit connects to Dunn Road and one must use Dunn Road to access I-270 with the only exceptions being the Riverview, Lilac, and Route 367) exits. Since Dunn Road handles two-way traffic, this has become a safety and congestion issue that MoDOT wants to address in the near future.