In Piet Mondrian's abstract painting Broadway Boogie-Woogie, what inspired the artist to paint yellow lines

Broadway Boogie Woogie is the painting consists of the checkerboard lines, previously black, but now blue, gray, red and yellow. The color yellow strongly assumed to be inspired by New York’s Yellow cabs. Yellow and gray areas have been painted with the same brightness. It is known as a jittery technique that painters used and it shows that our brains cannot distinguish these colors because they have the same brightness.

These atomized bands of stuttering chromatic pulses, interrupted by light gray, create paths across the canvas suggesting the city's grid, the movement of traffic, and blinking electric lights, as well as the rhythms of jazz.