Traffic is flowing again on Interstate 4 westbound after a crash involving a tractor-trailer in Seminole County.

It happened just before 6 a.m. Sunday around State Road 417 in Sanford and closed three lanes.

Florida Highway Patrol troopers said the crash involved injuries. However, the severity is not known.

The lanes reopened around 8 a.m.

There is no word yet on what caused the crash.