Should Arrow Boards and Portable Message Signs be finished with a reflective trim?

The recommendation that arrow boards and portable message signs should be finished with a non-reflective black trim aligns with established practices for visibility and safety in certain situations. Signage used during the day may be more effective with a non-reflective finish, as reflective materials can create glare and reduce readability under bright sunlight.

Reflections from illuminated or shiny surfaces can potentially obscure the message intended for drivers, especially in conditions where sunlight hits the signs directly. In certain scenarios, particularly where the signs are used in proximity to bright street lighting or in direct sunlight, a non-reflective finish can help ensure that the messages are clear and legible without the distraction of reflections.

While reflective materials might seem beneficial, their use is more appropriate in specific contexts, such as nighttime visibility. However, for daytime usage, especially in non-illuminated environments, the use of non-reflective black provides adequate visibility without the adverse effects that reflective materials might incur. This practice helps maintain the clarity of information conveyed to drivers, thereby enhancing road safety.