The Honolulu Police Department is reminding the public that the Honolulu Marathon will cause road closures and traffic delays from downtown to East Oahu before and during Sunday’s event.

While the marathon is expected to begin at 5 a.m., traffic control measures will be in place starting at 12:30 a.m. Sunday, HPD officials said. The race begins on Ala Moana Boulevard, heads downtown then out to Hawaii Kai before turning around and finishing in Kapiolani Park.

Road and lane closures will be in effect across the greater Honolulu area including downtown, Kaka­ako, Ala Moana, Waikiki, Diamond Head, Kahala, Aina Haina, Niu Valley and East Honolulu, HPD warned.

Officials said that beginning at 12:30 a.m., one or more lanes along the race course will be closed and/or coned until the athletes complete that section of the course.

“Roadways will be progressively opened as the athletes clear each area. Tow-away zones will also be in effect from 12 a.m. until 5 p.m.,” HPD said in a news release.

More details about the traffic advisories can be found at 808ne.ws/48QpqbU and the full marathon route map is at 808ne.ws/3XSIp0n.

HPD officials also noted that drone use will be prohibited at the marathon and that a temporary flight restriction has been approved by the Federal Aviation Administration for the event.

“Unauthorized drones pose a serious safety risk to event attendees and enhanced enforcement measures will be in place to track illegal drone operators,” HPD officials said in the news release.

They said HPD officers will have a “large presence” at the start and finish lines and along the race course throughout the day.

“Our top priority is to ensure that runners, spectators and the wider community can enjoy a safe Honolulu Marathon this year,” Maj. Clifford Ramson with HPD’s Major Events Division said. “We’re glad to support legacy community events such as the marathon, but public safety is everyone’s kuleana. We ask that all in attendance follow directions from our officers and other first responders.”