The city is looking to install bike lanes on the bridge in the late spring, the DOT said.
Construction beneath Gansevoort Plaza is set to begin in the spring or summer, the city said.
The blueprint is part of Vision Zero, the city's plan to eliminate traffic fatalities in New York.
The extended Columbus Avenue lane will better connect it to the Ninth Avenue lane, the DOT said.
Montserrat Daubon's pieces will be installed at 155th Street and Riverside Drive.
The DOT wants to designate a slow zone in Hudson Heights and install a crosswalk on Bennett Avenue.
The DOT held a workshop in Woodside this week to get input on how to improve the roadway.
Assemblyman Joseph Lentol requested a study due to congestion in the neighborhood.
The temporary bridge will hopefully be completed in the next six to eight weeks, according to the DOT.
New crosswalks, turn restrictions and bigger medians may come to Washington and Underhill avenues.
Comptroller Scott Stringer says the issues must be repaired before the program expands next year.
The bike lane would run along Jay Street from the Manhattan Bridge entrance to Fulton Street.
Latchman Singh, 34, was found lying unconscious in the crosswalk at Flatbush and DeKalb avenues.
Residents say the entrance is dangerous for straphangers due to poor visibility and speeding vehicles.
A ban on turns during peak hours did not apply to buses at the time of a man's death on Oct. 30, 2014.
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