Which of the following is NOT a requirement for CNG vehicle safety?

Ensuring vehicle aesthetics are prioritized is not a requirement for CNG vehicle safety because safety standards and regulations focus specifically on the functionality and reliability of systems that prevent leaks, manage pressure, and provide clear information to users. The installation of pressure release valves is essential for safely managing excess pressure that could lead to perilous situations. Checking connections with a non-ammonia soap solution is crucial for detecting any gas leaks, as ammonia can compromise the integrity of certain materials used in CNG systems. Additionally, having visible durable labels at fueling connections is mandated to ensure clear communication of safety information to operators, thus enhancing safety during fueling operations. Prioritizing aesthetics does not contribute to the operational safety or integrity of compressed natural gas vehicles, making it distinct from the essential safety measures required in this context.