Signal your turns. You're less likely to get hit when your movement doesn't take motorists by surprise. Let them know you're about to turn or move left or right by signalling with your arm. Point your left arm out to move left, and point your right arm out to move right. (You might have learned an old way of signaling a right turn with your left arm, but drivers have no idea what that means, so it's useless. Signal a right turn with your right arm.) Before signaling left, be sure to check your mirror or look behind you before signaling (since a car passing too closely can take your arm out).
Re-think music players and mobile phones. It's more important to hear what's around you when you're biking than when you're driving. Whether you want to ride with headphones is your choice, but doing so does increase your risk. Similarly, texting or talking with a mobile phone raises the risk level. When you're mixing with car traffic, the fewer distractions the better. Also, you'll want both hands free in case you have to brake suddenly.
