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This is where it gets confusing, the instructor said it is legal because the next sentence says
How to Pass on the Right
You can normally pass other vehicles on the left, some situations allow you to pass on the right. You can pass a vehicle on the right only in the conditions listed below, and only if you can pass safely. You can not drive on or across the shoulder or edge line of the road unless a sign allows it or when indicated by a traffic officer.
You may pass on the right:
When a vehicle ahead makes a left turn
Example: You approach an intersection. The traffic light is green and you want to drive straight through. Another vehicle is already in the intersection making a left turn. You must let that vehicle complete its turn before you enter the intersection.
Edge and Lane Lines
Solid lines along the side of the road tell you where its edge is - where the travel lane ends and the shoulder begins. It is illegal to drive across the edge line, except when told to by a police officer or other authorized official or when allowed by an official sign.
The driver of a vehicle may overtake and pass another vehicle upon the right only under conditions permitting such movement in safety. Such movement shall not be made by driving off the pavement or main-traveled portion of the roadway