Look over or through the vehicle in front of you for vehicles stopping or turning ahead. Check the roadside. Watch for vehicles that may leave the curb or enter from side streets or driveways. In heavy traffic look for places where you can leave the road in a hurry if needed. YOU Checking your mirrors is not enough.
Motorcycles have blind spots just as other vehicles do.
When changing lanes, make sure to turn your head and look over your shoulder at traffic behind you. That is the only sure way to see a vehicle behind you in the next lane. It is particularly important when making rapid lane changes, as many riders do. On a roadway with several lanes, check the far lanes as well as the one next to you. Another driver may be headed for the same space.