Originally Posted by Seattle Forrest

Why? That's as immaterial as whether her favorite color is blue. No helmet will stop a moving train.

There are good reasons why it's illegal in many places to bike with earphones in, at least in both ears. Dampening a sense that brings you important information about the world you're traveling through isn't a great idea. There's a measurable loss of attention ( paid to the hear and now ) that comes from listening to music, books, etc. A shocking 40 % of people listening to music players didn't notice a clown on a unicycle they as walked by him. ( Source: The queerest of all queer things. )