Final answer:
When passing a two-wheeled vehicle, it is recommended to allow at least 15 feet to the left.
Step-by-step explanation:
When passing a two-wheeled vehicle, it is recommended to allow at least 15 feet to the left of the vehicle. This is based on newer research suggesting that it is safer to give more space, and equals approximately 8 diameters side-to-side. The older rule of thumb was 5 side-to-side and 7-8 deep, but it is now considered safer to provide more distance.