The north end was extended from Fulton Street to the Manhattan Bridge as "Flatbush Avenue Extension".

The diagonal path of Flatbush Avenue creates a unique street pattern in every neighborhood it touches.

[4] The road ran roughly along what is now the eastern edge of Prospect Park and taking advantage of a low point in the Heights of Guan that form the spine of Long Island.

Streets such as Amersfort Place that are remnants of old parts of the avenue remain in the city grid as an echo of the past.

Flatbush Avenue is served by the following MTA Regional Bus Operations routes:[5] A dedicated bus lane corridor on Flatbush Avenue was proposed in 2022;[6][7] at the time, the B41 route traveled at an average speed of 6.5 miles per hour (10.5 km/h).