Multiple lanes of Southwest Freeway in Fort Bend County are back open at this time after an accident causing major traffic. Houston Transtar cameras showed heavy backup on the I-59 Southwest Freeway southbound at Dairy Ashford, near Highway 90 around 8:30 a.m. The cause of the stop was listed as a heavy truck accident. At this time, the lanes appear back open and traffic moving as normal. No other information has been provided as to what caused the crash.