In this video you will see a British cyclist take three close passes by a taxi, bus, and van driver. All three of them are professional drivers, i.e. they are paid to drive everyday for a living.
Drivers passing too closely is a problem that cyclists all over the world face. It's incredible dangerous to pass cyclists with less than 3 feet of room.
In many states in the US it is required by law for all motorists to pass cyclists with at least 3 feet between the two vehicles. Unfortunately this law is not strictly adhered to or enforced. A cyclists can fall, a driver in a parked car can open a door, there are plenty of scenarios where a cyclist would be killed by a driver passing too closely.
Tell you friends, spread the word. It's not okay to closely pass a cyclist. It doesn't matter how good of a driver you think you are, things can happen that are out of your control and it could end in serious injury or death.