Mayor de Blasio needs to follow through on every measure under his control and carry out his plan to make city streets safer.

Faced with far too many preventable traffic fatalities across the five boroughs, including horrifying cases of children cut down by cars and trucks, Mayor de Blasio has delivered an aggressive plan for safer streets. He needs to swiftly follow through on every measure within his control, and Albany must produce the legislation needed to further empower the mayor to save lives.

To wit: Gov. Cuomo and the Legislature must give City Hall power to cut the general speed limit from 30 to 25 miles per hour and to install speed cameras everywhere the mayor feels the devices can reduce aggressive driving.

In 2013, traffic fatalities took 286 lives — up from a low of 249 — including 173 pedestrians.

Many were preventable: if only a car had been traveling slower; if only a pedestrian had seen a left-turning truck; if only a negligent cab driver had focused, if only a senior citizen had been given more time to cross a street.

De Blasio proposed more than 60 steps. Among the many he can do himself, the mayor says he will toughen NYPD enforcement against moving violations; reengineer dangerous corridors and crossings, and improve lighting at 1,000 intersections, since many accidents occur at night.

But only Albany has the say over the speed limit and speed cameras. Unlike de Blasio’s pitch for the power to raises taxes on the wealthy to pay for universal pre-kindergarten, regulating city vehicular traffic is a hyperlocal matter that should be of no concern in the state Capitol.

That’s not how the Legislature, in particular the Assembly, has seen the picture.

Transportation Committee Chairman David Gantt — a Democrat who represents Rochester — has consistently resisted letting the city expand implementation of speed and red-light cameras.

It took twisting of arms and pulling of teeth for the city to win the right to roll out a mere 150 redlight cameras at select intersections and, last year, 20 speed cameras near schools.

While de Blasio is in the right here, he will have to pour on the charm to win the day in Albany. He can lobby with lifesaving facts on his side.

The faster a car is traveling, the more distance it takes for it to stop. Research shows that, when pedestrians are hit at 40 mph, 85% will die. At 20 mph, the number drops to just 5%. According to the city, the fatality risk at 30 mph is more than twice that at 25 mph.

Albany: Give the city the power to save lives on its streets. Mayor de Blasio: Get to it.