Safety Quiz - How much room

This is one of the questions for the Safety Quiz I'm looking for help with. Thanks for adding your own answers.

Question: When passing a cyclist, how much room should a motorist give?
A: Three feet. A little more than arm's length.

• Depends on how wobbly they ride
  
• If you are close enough to be kicked or punched, it might happen
  
• Move over to the other lane. Cars coming in the opposite direction will get off the road for you.
  
• You won't be able to pass them. Just wait until one of you turns off the road.
  
• Blowing the horn reduces the amount of room needed. The more you blow, the less room required. Tapping the horn makes it sound more friendly. Maybe you can play a nice song.
  
• Slow down until you're going almost the same speed. This allows plenty of time for the cyclist to recognize you're passing them. This reduces the cyclists' ability to avoid obstacles, but it's worth the risk.