A summary of selected City Hall actions this past week affecting central Los Angeles. : CITY COUNCIL

* SPEED HUMPS: Instructed the Department of Transportation to proceed with a plan to install speed humps in neighborhoods citywide. The speed humps--smaller than speed bumps--will be installed in neighborhoods on a priority basis, based in part on the number of accidents and prevailing speeds on given streets. But before officials consider an installation request, three-quarters of the residents of an affected block must approve of the proposal. Several council members said they already have requests from citizens willing to pay for the humps, which cost about $2,000 each. The cost will be spread among the residents of a block requesting them. Plans call for the possibility of city funding for the humps in neighborhoods whose residents cannot afford them.

* L.A. FIESTA BROADWAY: Approved the following street closures until 5 a.m. Monday due to the L.A. Fiesta Broadway, which is expected to draw 500,000 today: Broadway between 1st and 11th streets, Spring Street between Temple and 9th streets, Hill Street between 5th and 11th streets, Main Street between 9th and 11th streets. The closures began Friday night.

* HISTORIC-CULTURAL MONUMENT: Approved placing the Petroleum Building at 714 W. Olympic Blvd. on the city’s list of historic-cultural monuments. The 11-story building, built in 1925, features a lobby patterned after a Florentine palace of the early Renaissance.

* REWARD OFFERED IN MURDER: Approved offering a $15,000 reward for information leading to the arrest and conviction of the person or persons responsible for the death of Lourdes Urmeneta. Urmeneta, 81, was struck in the head by an assailant using some type of weapon while she was parking her car near her home in the 200 block of West 120th Street on March 11. She died two days later.

HOW THEY VOTED

How South-Central and Eastside City Council representatives voted on selected issues.

* CAR ALARMS: Approved an ordinance to ban the sale and use of car alarms that make noise while no break-in is being attempted. These alarms, which emit beeps or chirps when they are on, have caused numerous complaints from citizens who say the continual noise is a nuisance. A fine of $30 would be imposed for violators, but ticketed people would have six months to change their vehicle’s alarm system without penalty. Passed 12-0. Voting yes: Mike Hernandez, Nate Holden, Jackie Goldberg, Rudy Svorinich Jr. Absent: Richard Alatorre, Mark Ridley-Thomas, Rita Walters.