Drivers on Highway 1 north of Santa Cruz will be subject to a rolling closure of the roadway on Sunday, as competitors in the bike portion of the Ironman Santa Cruz Triathlon participate in the up and back, 56-mile portion of the race.

Northbound Highway 1 will be closed from 7 to 9:30 a.m. Sept. 10 from Western Drive in Santa Cruz to Pigeon Point Road in San Mateo County as riders complete the first leg of their ride.

Southbound Highway 1 will be closed from 8:15 to 11:45 a.m. Sept. 10 from Pigeon Point Road to Western Drive as riders complete the return leg.

CHP will be on hand to assist with traffic control.

Additionally, CHP and traffic control teams will permit local traffic to enter Highway 1 during closure hours, when safe to do so, at the following locations: Shaffer Road, Dimeo Lane, Scaroni Road, Coast Road, Laguna Road, Bonny Doon Road, Davenport Avenue, Davenport Landing Road, Cement Road, Hoover Road, White House Canyon Road, Rossi Road and Gazos Creek Road.

Drivers on the course route can expect delays of up to 30 minutes depending on the volume of riders passing at any given time.

For event details on the Ironman 70.3 Santa Cruz, visit ironman.com/im703-santa-cruz.