(KMOV) -- Emergency crews were called to the scene of a major accident on I-55.
It happened around 8:00 a.m. on Thursday on northbound I-55 near Highway M.
Investigators say that this was a crossover crash.
The Missouri Highway Patrol was forced to temporarily shut down I-55 between Highway Z and Highway M.
Traffic in that area was backed up for miles.
The highway has since reopened.
No word yet on any injuries or what caused the accident.