Final answer:
The heaviest radio use usually takes place during morning and evening commuting times, also known as 'drive times,' which feature morning talk shows and a mix of news and entertainment.
Step-by-step explanation:
The heaviest radio use, when most people are listening, typically occurs during the morning and evening commuting times. These periods are known as 'drive times' and are highly valued by advertisers due to the high number of listeners. During these times, listeners may engage with various programs such as morning talk shows, news broadcasts, and on the way home, they might catch up with entertainment or informative programs.