RALEIGH, N.C. — Ice lingering from Thursday's snow and rain caused travel problems on Triangle roads Friday morning and forced the delay of several area school systems.

In the early-morning hours of Friday, there were several wrecks on Raleigh's Beltline. There were more wrecks during rush hour on Friday, with the most gridlock-causing accident happening near the new Pedestrian Bridge on Interstate 440.

There were only minor injuries reported in the wrecks.

Several school systems were delayed for two hours as many areas north of the Triangle had more serious icy conditions on their roads. During the worst of the ice early Friday morning, police in Raleigh shut down part of the beltline.

During the overnight hours, three cars crashed on Interstate 440 near Hillsborough Street and Western Boulevard.

Police blamed the accidents on icy conditions.

Salt trucks treated the area. An officer on the scene said the I-440 bridge over Hillsborough street is usually one of the first to freeze.