Good idea - no.

I wear headphones, too frequently. Especially on long rides. I use the loop kind which do allow you to hear some road noise, car approaching from behind, and they do an excellent job of reducing the wind howl. Sometimes I wear them just to quiet down the ambient noise while riding. http://www.amazon.com/Sony-MDR-J11G-...1456032&sr=8-2

But, it's a risk.