A person moving back and forth across the edge of an overpass, threatening to jump into the lanes below, shut down both northbound and southbound lanes of Interstate 5 in Del Mar Heights on Friday, creating a nightmare that snarled traffic for six hours and counting. The incident was first reported around 11:40 a.m. on the Del Mar Heights Road overpass, according to online California Highway Patrol logs. A SigAlert was issued early in the afternoon, and northbound lanes for the freeway and on the overpass were shut down by 12:30 p.m., according to CalTrans. The southbound lanes also closed intermittently, due to the individual running back and forth along the overpass railing over both sides of traffic, according to the log. Crisis negotiators were at the scene. Firefighters had a ladder truck reaching up to the overpass, as well as what appeared to be a large cushion underneath in the northbound lanes. The San Diego Police Department, which responded to the scene, told commuters on social media to expect “significant traffic delays … for the time being.” Commuters stuck in traffic reported that they had gone only a handful of miles over the course of three hours Friday afternoon. Many drivers were seen staring at their phones or trying to find freeway exits that were already jammed with traffic. The traffic jam spread onto surface streets and other freeways, including Interstate 15, heading into the afternoon rush hour. ...read more read less