When is passing prohibited?

• When you are within 100 ft of a bridge, viaduct or tunnel
• When you are on a hill or curve where it is not possible to see oncoming vehicles
• When an oncoming vehicle will make the passing unsafe
• All of the above
  Explanation:

  "Passing is prohibited: 1. Within 100 feet of a bridge, viaduct or tunnel. 2. When a car approaching from the opposite direction makes passing unsafe. 3. On a hill or curve where it is not possible to see oncoming vehicles which might be close enough to be a hazard."