President Donald Trump’s Asia trip stopover in Honolulu on Friday and Saturday may cause massive rush-hour traffic delays, city and state officials warned Wednesday.

How bad could it be?

The city is allowing its 10,000 employees to take vacation on Friday to help cut down on potential traffic congestion.

“We’re doing this out of an abundance of caution,” Honolulu Mayor Kirk Caldwell told a news conference Wednesday.

With Trump expected to use the H-1 freeway and to visit Waikiki on Friday afternoon and evening, the Honolulu Police Department is bringing on hundreds of extra officers to provide security and shut down presidential motorcade routes.

“We’re asking residents and visitors, to some extent, to avoid these areas if possible. Otherwise you could be stuck in these areas for a very, very long period of time,” Caldwell said.

Up to three anti-Trump demonstrations are expected, officials said, including a march from Ala Moana Beach Park to Thomas Square and a rally at the state Capitol.

Information about the president’s visit remains fuzzy for security reasons, but Clyde Ho, assistant police chief, said motorists should expect eastbound routes along the H-1, from Joint Base Pearl Harbor-Hickam to Waikiki, to be shut down generally between 2 and 3 p.m. and from 7 to 8 p.m. Westbound road closures also may occur from 4 to 5 p.m.

Plans, routes and directions could always change as well, Ho added.

Bus and Handi-Van service will continue as usual but could experience delays, officials cautioned.

Caldwell noted that the city’s Joint Traffic Management Center will be up and running during the visit to adjust traffic signals in an effort to help with traffic flow.

Ho urged people to exercise patience.

“But most of all, if you can plan ahead that’s probably the best thing to do. Maybe if you do have to be in Waikiki for whatever reason, lock up early,” he said. “Please leave early. You don’t want to be caught up in the traffic.”

Those who do get caught in a road closure might have to wait up to an hour and a half, Ho said.

Caldwell said road barriers are expected to go up in Waikiki on Thursday night and early Friday in anticipation of the road closures.

“It is a message to the public that things are going to get more difficult in the Waikiki H-1 area starting Friday going into Saturday,” the mayor said.

“We’re not saying people shouldn’t go to Waikiki if they need to go, and of course it’s a huge, important part of our economy,” he said. “We want people to enjoy their time when they go there. We want them to plan and make sure they are not caught in all the expected delays.”

Hawaii J20+ is planning a protest from 4 to 6 p.m. Friday at the state Capitol on South Beretania Street. World Can’t Wait will hold a protest march at 10 a.m. Saturday from Ala Moana Park to Thomas Square, where a rally will be held at 11 a.m.

Jan Dickey of Hawaii J20+ said hundreds — and maybe more — are expected to attend the state Capitol rally.

A lot of people in Hawaii are unhappy with “Trump’s nationalist rhetoric that he uses to divide people in and out of the United States,” among other things, Dickey said.

“There’s a lot of buzz and excitement about this protest,” he said. “It sure feels like there are going to be hundreds there.”

Trump’s first official trip to Hawaii and Asia is expected to include a stop at Pearl Harbor and the USS Arizona Memorial, according to the White House.

Few other details have been released for a trip that will include stops through Nov. 14 in Japan, South Korea, China, Vietnam and the Philippines.

Caldwell said Trump’s visit could feel different from previous presidential stopovers.

“Given the nature of this visit and where the president is going to be going, I think it’s going to impact areas where a lot of us work,” he said.