Which of the following is NOT a requirement for tail lamps?

Tail lamps are crucial for vehicle safety, as they signal to drivers behind the vehicle when the vehicle is stopping or slowing down. Each requirement has important implications for their functionality, ensuring proper visibility and communication on the road.

Being securely mounted is essential to maintain their effectiveness. If tail lamps are loose or improperly affixed, they may not function properly or could fall off, creating a hazard. Additionally, tail lamps must not be obstructed; this ensures that they can be seen clearly by drivers behind the vehicle without any interference, which is vital for safety during nighttime or in low visibility conditions.

The requirement that tail lamps must burn steadily ensures that the lights are continuously lit when active. This steady illumination plays a critical role in informing other drivers of the vehicle's presence and intentions.

Regarding the color, while it's important for safety that tail lamps are visible and distinct, the specific requirement is that they should be red or utilize red lenses rather than being painted red. The coloring of the lens is defined by regulations for safety rather than the paint itself. Therefore, the focus is on the proper functioning and visibility of the tail lamps rather than the specific paint application, making this the answer that does not fit with the established requirements.