Highway 1 was closed east of Chilliwack for hours on Friday due to an early morning crash.
Drive BC says the highway was closed in both directions between Annis Road and Exit 135 for 6.1 kilometres.
Around 3 p.m. only the right lane eastbound remained closed.
Traffic was very heavy in the area all day and drivers are being urged to take extra care.
It appears the issue was a flipped semi-truck that rolled and blocked all lanes of traffic.
BC Emergency Health Services said it was called about the crash shortly before 6 a.m. and deployed two ambulances. No patients were taken to hospital.