When parking on the traveled portion of a highway outside of an urban district, how far must approaching traffic be able to see your vehicle?

The correct distance for approaching traffic to see your vehicle when parked on the traveled portion of a highway outside of an urban district is 60 meters. This regulation ensures that parked vehicles are visible to oncoming traffic, reducing the risk of accidents by providing sufficient distance for drivers to react.

When a vehicle is parked on the traveled portion, the visibility requirement is crucial for safety, as it allows other drivers ample time to notice the vehicle and adjust their speed or position accordingly. The 60-meter distance is a balance between visibility and practicality, ensuring that drivers can spot the parked vehicle without being too far away, where it might not be seen in time.

The other distances provided in the answer choices are either too short or too long for this specific situation. A shorter distance could lead to unsafe situations where approaching drivers do not see the parked vehicle until it's too late, while a longer distance may not be realistic or necessary for practical traffic management.