How should you position your reflective triangles when parking on the side of a two-lane, level, undivided, and straight highway?

Question

How should you position your reflective triangles when parking on the side of a two-lane,  level, undivided, and straight highway?

Accepted Answer

One within 10 feet of the rear of the vehicle, one about 100 feet to the rear, and one about 100 feet  - in front of the vehicle