NEW: Man shuts down the I-5 freeway in San Diego (one of the busiest interstates in the country), for 8 hours as he went back and forth on the railing, threatening to jump. The man was first reported on the overpass at 1130. He was there for the next 8 hours. Commuters say it took three hours just to go a few miles. The man was eventually talked off the ledge and taken into custody around 8pm. Insane.