But the North Carolina truck driver hit a gridlock on northbound Interstate 5 and had moved about a quarter-mile over the past 5-1/2 hours, as of about 8 p.m. The problem: Tractor-trailer drivers disobeying a chain-up order and trying to tackle the Marquam Bridge on-ramp. Dave Thompson, Oregon Department of Transportation spokesman, said the bridge has been shut down off and on since 1 p.m. because of disobedient semi drivers.
