What must stop lamps be visible from during daylight conditions?

The correct answer is that stop lamps must be visible from 300 feet during daylight conditions. This visibility standard is important for ensuring that other drivers on the road can clearly see when a vehicle is slowing down or stopping, which helps prevent collisions and enhances overall road safety.

In daylight, the distance of 300 feet allows for a sufficient reaction time for drivers behind the vehicle to notice its stop lamps illuminate. This regulation helps promote safe driving practices and ensures that vehicles are equipped with effective signaling devices.