Complete the sentence
At the start of the twentieth century,traffic in the big cities
New York and London
Pedestrians had difficulty crossing the street because
Their wore no rules for drivers
The New York police Department had to
The New York police prepartmet halo to create a specials qual to handle traffic
The first traffic lights in New York were
At the intersection of fifth aye rue and 42nd stover
The only problem with traffic lights nowadays occurs