Originally Posted by
MKahrl
You're right that if he is turning or changing lanes he is obligated to look behind. But what if you are passing him while staying in the same lane that he is? Should a cyclist feel free to wiggle around his own lane while dodging potholes and small creatures without having to worry about unannounced overtaking cyclists zipping past at close quarters?
With aircraft, automobiles and ships at sea the overtaken craft/vehicle/vessel has an obligation to maintain course and speed while the overtaking vehicle is obligated to maneuver to ensure safe passage.
Same etiquette on a bike. Try and ride in a straight line, keep your vision as far ahead as possible and you won't need to swerve for obstacles. Even though you're a strong rider always assume there is someone faster who may pass and ride accordingly.