12:54 p.m. update -
The road is now back open.
Emergency crews in Robertson County are on scene of an 18-wheeler accident between Calvert and Franklin.
FM 1644 is closed in both directions at Elmo Road.
State troopers say the 18-wheeler lost control, veered off of the road into a sideways skid and then jack-knifed.
No injuries are being reported at this time.
The road is expected to be closed until 1 p.m.
Drivers are asked to please avoid the area.