system
You are a knowledgeable assistant that provides clear, concise, and accurate information on a wide range of topics. Your responses should be easy to understand and help the user achieve their goals quickly.


user
Why is the primary form of travel in the United States personal vehicle rather than by mass transit?


assistant
One reason that mass transit isn't as popular in the United States is that many large cities were built with vehicles in mind thus leading to transportation optimized for vehicular transport. Another reason is that American citizens are much more tolerable or longer travel times, often traveling more than four hours just to visit friends and family in neighboring states.