With an estimated $1.7 billion investment over 10 years, the legislation would also prioritize pedestrians and bus service over cars.

Pushing for bike safety

A spike in deaths this year — 25 cyclists killed by cars on city streets, the highest toll in two decades and 15 more than last year — has led to criticism that the city is failing to protect bike riders.

Mr. de Blasio has made street safety one of his signature initiatives, including his Vision Zero plan to eliminate traffic deaths by 2024.

But after a spate of cyclist deaths over the summer, he announced a “green wave” plan to clamp down on reckless drivers and other safety threats to cyclists .

Cycling advocates have criticized the mayor for not pushing harder to continue earlier progress in creating bike lanes, begun in earnest under Mayor Michael R. Bloomberg.

They have called on the city to create a citywide interconnected network, a process that would require the replacement of many traffic lanes and parking spaces with bike lanes — a contentious stance in parts of the city that rely heavily on cars.

Changing traffic flow

In 2021, New York will become the first big city in the country to adopt congestion pricing, requiring drivers to pay a toll to enter parts of Manhattan. Bike advocates hope the resulting decrease in traffic will allow the city to convert lanes for bus, bike and pedestrian use.