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The first thing to consider is that sound travels slower than before. This would influence how we perceive sound from different distances. For instance, if we were further away from a sound source, it would take more time for the sound to reach us than before. In short, there would be a noticeable delay in hearing sounds, especially from distant sources.

The decrease in the speed of sound would make it more challenging to determine the direction from which a sound is coming. While humans can still locate sound sources by the difference in time it takes sound to reach one ear compared to the other, a slower sound speed would make this process less accurate.

The reduced speed of sound would have a profound impact on communication. Conversations would be impacted, especially for people standing farther apart, as they would have to wait longer for the sound to reach each other. Public events such as speeches and concerts would also be greatly affected since sound would travel slowly through the air, making it hard for those farther away to accurately hear what is being said or played in real-time.

Now, let's consider the situation of living next to a freeway. Vehicles moving at high speeds would produce sound that travels slower than their actual speed. This would result in sound reaching people living nearby with a time lag, meaning that they would hear the noise of vehicles that had already passed by their location. At the same time, due to the slower speed of sound, noise from the freeway would be more spread out, and it might be difficult to pinpoint the exact source of the noise.

Although there are several drawbacks to a slower speed of sound, there might be some potential benefits. For instance, noise pollution might decrease in areas far from the freeway since it would take more time for noise to reach those locations. Furthermore, slower traveling sound could potentially provide better insulation for houses built with certain materials, mitigating some of the noise from the freeway. In conclusion, if the speed of sound were to suddenly decrease to 20 meters per second, it would have a significant impact on daily life and how we perceive sound. Challenges in communication, localizing sound sources, and distinct changes while living near a freeway would be faced. Despite some potential benefits, the drawbacks would outweigh them in this situation.