Twelve additional sets of video cameras are expected to be placed at intersections through Waikiki and other neighborhoods that will be traveled by Hono­lulu Marathon runners next month.

The new cameras are part of a series of security measures being put in place by the city in advance of this year’s marathon, which runs Dec. 8, in the wake of April’s Boston Marathon bombing. Three people were killed and more than 260 people injured.

Legislation approving the cameras goes before the City Council on Wednesday. They will be in addition to 38 traffic cameras already in place along the route from downtown through Waikiki to East Hono­lulu.

Cameras placed at three of the new locations will be permanent, while those at nine other sites are temporary and would be scheduled to be taken down shortly after the event, said Jesse Broder Van Dyke, a spokes­man for Mayor Kirk Caldwell.

The three permanent cameras will be at Ala Moana Boulevard and Queen Street, Nim­itz Highway and Nuu­anu Avenue, and Ala Moana Boulevard and Pii­koi Street, Broder Van Dyke said. At $8,000 apiece, they are capable of swiveling in different directions.

The nine other sites would each have three stationary cameras that will face different directions. Those cameras cost about $100 each, or $300 for each site, Broder Van Dyke said.

Several other security measures are being undertaken this year.

The city Emergency Operations Center will be activated and maintained by the Department of Emergency Management from midnight until 6 p.m. on the day of the race, Broder Van Dyke said. The marathon will pick up the cost of paying for the emergency management employees who will need to work that day, in addition to the tab for the Hono­lulu Police Department officers whom the marathon traditionally has paid, he said.

Meanwhile, crews from the Department of Facility Maintenance will be enforcing the Stored Property and Sidewalk Nuisance ordinances to clear sidewalks along the race route of any obstructions in the days leading up to the race, Broder Van Dyke said.

Pat Bigold, Hono­lulu Marathon spokes­man, said event officials will not disclose security plans until closer to race day.

The Honolulu Marathon consistently ranks among the top marathons in the world. In 2012, 24,413 people ran, and about 10,000 volunteers, supporters and race observers took part. The 26-mile route begins at Ala Moana Park, heads downtown, circles back east to Hawaii Kai and ends at Kapiolani Park.