A year after a cyclist was killed on a dangerous street in Park Slope, city officials have agreed to post signs to make the road safer.

In the next eight weeks, Transportation Department officials will post "Bike Route" signs along Fifth Ave. between Carroll and Dean Sts.

Traffic lanes will also be marked as shared lanes for cars and bicycles.

"We're just happy that changes were made. Liz would've been happy too," said Becky Padilla, 27, whose sister Elizabeth was killed on that stretch while bicycling to work a year ago.

Elizabeth Padilla, an avid cyclist, was a pro-bono lawyer who turned down a six-figure corporate attorney job to practice poverty law.

Fifth Ave. north of Carroll St. is notorious among cyclists: A dedicated bike lane on the road ends abruptly when the avenue narrows, a few blocks south of connecting lanes on Dean and Bergen Sts.

"There's always been a lot of confusion among cyclists and motorists about how to interact there," said Aaron Pasternak, 36, an organizer with Park Slope Neighbors and a cyclist.

Noah Budnick, deputy director of advocacy for Transportation Alternatives, called the signs "a step in the right direction."

"We were very saddened by Liz Padilla's death, and we continue to be committed to making improvements to the city's streets that make it as safe as possible for bikers to ride," said DOT's spokeswoman Kay Sarlin.

There will be a memorial ride today at 8 a.m., starting at Fifth Ave. and Prospect Place.

Advocates plan to ride to the DOT office to deliver flowers and a letter calling for better protection for bicycle commuters.