City transportation officials also plan to redesign 50 intersections to make cyclists more visible to turning motorists by using measures such as bike boxes, where cyclists wait in front of vehicles, and bike lanes painted green to provide more of a visual cue.

They will also expand a pilot program known as the “green wave” that adjusts the timing of green light signals so that all traffic — including cyclists — going about 15 miles per hour can pass one green light after another in a corridor. It reduces the temptation of running a red light and also slows down traffic.

The bulk of the money for the bike safety program will be used to hire more city transportation workers to carry out the improvements, adding to the 110 workers the city currently employs.

Police officers will also step up enforcement of traffic rules at 100 high-crash intersections, specifically targeting trucks. This month, the police had already discontinued a widely criticized practice of issuing tickets to cyclists breaking traffic rules at a site following a fatal crash.

“I think the things we are proposing here are things we know work,” said Polly Trottenberg, the city’s transportation commissioner. “Building out protected infrastructure, safer intersection designs, and targeted enforcement of dangerous driving behaviors.”

The mayor’s plan drew cautious praise from some cycling advocates, who said the measure would help the city — and the mayor — focus their attention on bike safety.

“We think on paper it looks good — we need more protected bike lanes,” said Jon Orcutt, the communication director for Bike New York, an education and advocacy group. “But the devil is in the implementation.”