A rollover accident involving a semi-truck Wednesday at 6:50 p.m. in Tacoma blocked the two left lanes of the ramp from eastbound SR 16 to northbound I-5, according to Washington State Department of Transportation officials. Washington State Patrol and Tacoma fire responded to the accident while all traffic was diverted off at Union Avenue so crews could upright the overturned vehicle. The accident was cleared by 8:25 p.m.