This would depend on local laws, however in general, an automobile temporarily crossing a double yellow to give a cyclist more room is entirely predictable. Au

This would depend on local laws, however in general, an automobile temporarily crossing a double yellow to give a cyclist more room is entirely predictable. Automobile drivers who swerve (sudden steering input) in such a situation should give more attention to what lies ahead or, if visibility is poor, reduce speed. A relative speed of 20-30 mph with any hazard or obstacle should not require sudden inputs, but rather should be within the driver's control via smooth application of vehicle controls that are less likely to cause undesired behavior such as brake lock, and which also will not surprise other motorists. Of course, the proliferation of cell phone use while driving vehicles of all sorts contributes to this sort of unpredictable behavior, since drivers who split time between observing the road and observing a cell phone's display will have reduced reaction time.