Former Gov. Andrew Cuomo has not entered the race for mayor of New York City. But private planning suggests he is laying the groundwork to do so.

Mr. Adams and former Gov. Andrew M. Cuomo have both been popular with Black voters, setting up a potential showdown that could decide the Democratic mayoral primary in New York City.

After twists and turns, a contentious plan meant to reduce traffic and pay for transit improvements is scheduled to take effect at midnight Sunday.