Final answer:
The warning triangle should be placed at a distance of 100 meters (300 feet) on a road that is not an Autobahn.
Step-by-step explanation:
The correct distance for placing a warning triangle on a road other than an Autobahn is 100 meters (300 feet). This ensures that oncoming traffic has sufficient warning and time to react to the broken-down vehicle ahead.
It is important to consider road conditions and visibility when placing the triangle, as these factors can affect drivers' reaction times and stopping distances. In general, the triangle should be visible to other drivers for at least 100 meters to provide enough time for a safe response.