For your safety, when setting out reflective triangles, you should:

When setting out reflective triangles, the key consideration is maintaining your safety while ensuring that you are visible to oncoming traffic. Holding the triangles between yourself and oncoming traffic puts you in a position of visibility while providing a clear signal to drivers about the presence of a stationary vehicle or emergency situation ahead. This method minimizes your risk by keeping you aware of traffic while you perform the task.

Setting the triangles up quickly with your back to traffic would expose you to the hazard of oncoming vehicles that you may not be aware of. Placing them only in front of your vehicle does not account for traffic approaching from other directions, which may lead to a lack of proper warning for those drivers. Marking the location with a flashlight, while useful in low visibility, does not address the immediate need for visible warning triangles to effectively alert drivers before they reach your vehicle. The focus on maintaining awareness of traffic while deploying the triangles is critical for your safety as well as the safety of others on the road.