Ride like you are invisible and don't believe that helmet will save you, avoiding accidents will. If you want to wear one its your choice, I drive in Boston traffic every day, nobody uses directionals, if they do they are probably going the other way. They run stop signs and red lights amongst many other idiotic driving manuvers. I drive 20-25,000 miles a year and most of it in boston traffic and I avoid an accident a day. If you follow at a safe distance they pull in front of you, even if there is only one car length. Look all around , check your mirrors constantly, I even practice skidding with the front tire(not in traffic) although that practice has paid off in traffic. All I am saying and I know we can't avoid them all is avoiding accidents is better than a helmet anyday.