SCHOOL CHILDREN, WERE FORCED TO USE THEIR BICYCLES ON FIELD TRIPS DURING THE FUEL CRISIS IN THE WINTER OF 1974. THERE WAS NOT ENOUGH GASOLINE FOR SCHOOL BUSES TO BE USED FOR EXTRACURRICULAR ACTIVITIES, EVEN DURING DARK AND RAINY WEATHER, 02/1974

Found it here…

Rather have them use bicycles, instead of cars