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Question:

You must stop on a hill or curve on a two-lane-two-way road. How far should you place reflective triangles?

A Within 500 feet behind you.
Explaination

Back beyond any hill, curve, or other obstruction that prevents other drivers from seeing the vehicle within 500 feet. If line of sight view is obstructed due to hill or curve, move the rear-most triangle to a point back down the road so warning is provided.