Which of the following is a requirement for road signs?

• A. High cost for installation
• B. High visibility - retro-reflective
• C. Low maintenance
• D. Dim lighting

Answer: (B)

High visibility is a critical requirement for road signs, as they are essential for ensuring the safety of drivers, pedestrians, and cyclists. Retro-reflective materials are used in the manufacturing of these signs to enhance their visibility during both day and night conditions. This means that when headlights from vehicles shine on the sign, the retro-reflective material reflects the light back towards the source, making the signs more noticeable at night. This feature significantly aids in guiding and warning road users effectively, contributing to safer travel.

The other factors mentioned, such as cost, maintenance, and lighting conditions, are not primary requirements for road signs. While low maintenance is beneficial, it does not directly influence the effectiveness of a road sign in terms of visibility and safety. Dim lighting would adversely affect visibility, and high installation costs do not pertain to the fundamental requirement of road sign functionality. Thus, high visibility using retro-reflective materials stands out as the key requirement for road signs.