I took a cycling class at a local community college in the seventies , right after buying my first light weight 10 speed. My wife and I had decided to “park” our cars and ride bicycles for transportation , car free for a few years. The class , for both of us , was informative and heavily focused on safety , even back then . We didn’t have the distractions or safety features that we have today but some of the techniques still ring true . Visibility, hand signals , and eye contact when approaching intersection are all valuable tools . I have a Lumos helmet with built in flashing or always on lights (front and back) with turn signals that are controlled by a remote switch on the handle bar. Like squirtdad , I have been told at stop lights how beneficial it is to drivers to be able to see me and know if I am turning . I still use hand signals as well.