What is the minimum height of lettering required on an LPG price sign?

The minimum height of lettering required on an LPG price sign is essential for ensuring visibility and readability from a distance, which is critical for safety and regulatory compliance. A height of 3/4" allows drivers and customers to easily read the price of LPG (liquefied petroleum gas) without straining, particularly in outdoor environments where distances can vary significantly. This specific height standard is often established by regulatory bodies to ensure uniformity and to provide clear communication to consumers.

A lettering height of 1/2" may not provide sufficient visibility, especially for individuals driving past the signs at higher speeds. Similarly, while larger heights such as 1" or 1 1/2" could enhance visibility even further, they exceed the minimum requirement, which is set at 3/4". Thus, the 3/4" height strikes a balance between adequate legibility and regulatory compliance, making it the correct answer.