Tractor-trailer overturns exiting I-526 onto I-26 January 14, 2011 at 2:31 PM EST - Updated June 15 at 5:40 PM CHARLESTON, SC (WCSC) - The South Carolina Highway Patrol responded to an overturned tractor-trailer that caused rush-hour traffic problems for many commuters Friday morning. A tractor-trailer overturned while exiting Interstate 526 onto I-26 westbound. The Highway Patrol closed the exit ramp on I-526 to enter onto I-26 for several hours. The tractor-trailer was laying on its side on the right side of I-26. The wreck has since been cleared by the Highway Patrol. Copyright WCSC 2011. All rights reserved.