Interstate 35 traffic near Cameron was snarled after an accident involving a tractor-trailer and a MODOT truck.
The wreck happened shortly after 10 a.m. Tuesday at mile-marker 74.6, located 24 miles north of Cameron.
All southbound lanes were blocked and some northbound lanes were affected as well, creating a big back-up of at least four miles.
Southbound lanes reopened about 3 p.m. and northbound lanes reopened about 3:30 p.m.
No injuries have been reported.
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