A childhood belief about buses

I was 5 (1963) riding the little school bus through the streets of Chicago after school and I remember noticing how a little green arrow would flash on the dashboard prior to each turn. When I asked the driver about the arrow, she said it showed which direction the bus would turn. I suddenly felt panicked at the idea that my destination was ultimately controlled by the whims of this vehicle, and that I may not return home that afternoon, ending up God knows where. I kept my fear to myself, and was relieved to find myself deposited at the old brownstone building where I lived. Funny thing is, as soon as I got home, I forgot all about this close brush with technological capriciousness.