From the Library of Congress photo archive a 1942 picture from Burbank, CA:
The bicycle brigade at Lockheed Vega Aircraft Corporation. Employees living within four miles of Lockheed’s plant may purchase bicycles through the company and resell them to the company when need for them no longer exists. This mode of transportation is becoming increasingly popular, and has resulted in the sale of 2,400 bicycles in record time. This is part of the swing shift on the way home at 12:30 am.