We've received some complaints about road runner. This is because he has been accelerating his delivery business by traveling long distances at high speeds - actually faster than sound. For example, by traveling at about 1300 feet per second (a bit more than the speed of sound at 20C), he can make a delivery from Washington DC to Chicago in a bit less than 90 minutes. However, this causes a sonic boom along the way. Road Runner has agreed to limit his speed to just less than the speed of sound except in rural areas in the summer daytime (when sound waves are more strongly refracted up). The graph is from the wikipedia article on the speed of sound.
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