WALNUT CREEK — The CHP lifted a Sig-alert and reopened a connector ramp closed between two major highways Wednesday afternoon for nearly four hours in response to a pedestrian threatening self-harm, authorities said.

At 1:51 p.m., CHP officers responded to reports of the pedestrian on the connector ramp from eastbound Highway 24 lanes to northbound Interstate 680, Officer Adam Lane said. There were no reports of any associated vehicle connected to the pedestrian.

Members of the Contra Costa Sheriff’s crisis-negotiation team also responded to the scene, as did Contra Costa County firefighters, Lane said.

Shortly before 2:20 p.m., California Highway Patrol officers declared the alert closing the ramp with no estimated time of reopening. Commuters approaching the area were advised to seek alternate routes.

Soon after 2:30 p.m., Walnut Creek police also issued an alert to community members about police activity, asking them to avoid Mount Diablo Boulevard and Boulevard Way and Camino Diablo. Those streets form an intersection directly below the connector ramp.

Soon after the closure, traffic backups began extending miles along eastbound Highway 24 and clogging nearby surface streets in Lafayette, Orinda and Pleasant Hill.

Shortly after 5:45 p.m., the person peacefully surrendered to officers and was transferred to waiting paramedics’ care, Lane said. The Sig-alert reopening the ramp was lifted at 6:03 p.m., with residual traffic backup continuing to cause delays.

If you or someone you know is struggling with feelings of depression or suicidal thoughts, the National Suicide Prevention Lifeline offers free, round-the-clock support, information and resources for help. Reach the lifeline at 800-273-8255.

Contact George Kelly at 408-859-5180.

Source: www.mercurynews.com