Which of the following is an example of a common noise compatibility measure?

A common noise compatibility measure is a strategy employed to mitigate the impact of noise generated by aviation activities on surrounding communities. Noise barriers are an effective solution because they physically block and absorb sound, thereby reducing the noise that reaches residential or sensitive areas near airports. These structures can be constructed from various materials and can be strategically placed in locations most affected by airport operations.

In contrast, other choices do not directly address noise mitigation. Flight training programs do not offer noise reduction; instead, they focus on pilot education. Increased flights would likely result in higher noise levels rather than a compatible measure. Promotional advertising, while potentially effective for public relations or awareness, does not influence noise levels or seek to reduce their impact. Thus, noise barriers stand out as a specific and practical measure designed to enhance noise compatibility in aviation environments.