A summary of selected City Hall actions last week that affect the Westside. : CITY COUNCIL

CRENSHAW CRUISING BAN--Approved a motion to close a four-mile stretch of Crenshaw Boulevard on Sunday nights to deter automobile cruising. Crenshaw will be closed from Adams Boulevard to Jefferson Boulevard from 10 p.m. to midnight, and from Jefferson Boulevard to the Inglewood city limits at 79th Street from 9 p.m. to midnight. The action was recommended by the Crenshaw Boulevard Community Task Force, consisting of local residents and business people, who complained that the large numbers of Sunday night cruisers created gridlock, noise pollution and littering. MTA buses, emergency vehicles, patrons of local businesses and local residents will be allowed access to the street.

* SPEED LIMIT INCREASE--Approved an ordinance raising the speed limit to 35 m.p.h. from 30 m.p.h. along Motor Avenue between Manning Avenue and the city limits just south of Venice Boulevard.

* SPEED LIMIT DECREASE--Approved an ordinance reducing the speed limit to 25 m.p.h. from 30 m.p.h. along Stone Canyon Road between Chalon Way and Fontenelle Way, a stretch of road that fronts the Hotel Bel-Air.

HOW THEY VOTED

* SHUT-OFF VALVES--Instructed the City Attorney to prepare an ordinance, effective July 1, 1995, that will require all new construction of residential, commercial, industrial and government buildings to install valves that will automatically shut off main gas lines during an earthquake. The valves could cost homeowners up to $300 for purchase and installation. Passed 12-3. Voting yes: John Ferraro, Marvin Braude, Zev Yaroslavsky, Ruth Galanter, Mark Ridley Thomas, Nate Holden, Jackie Goldberg.