Why was transportation moved off the streets during the gilded age

I believe that transportation moved off the streets during this time simply because the streets were becoming to crowded as the cities grew and with the increase of people.

The  pan-african movement  was an "emotional, cultural, psychological and ideological  movement  that began among the  african  dispora in the western hemisphere, for a closer  purpose, so that  african  people could feel secure, attain political, economic as well as psychological power visa vis other races or world regions" .