This is the answer: Two million people can access the site within 20 minutes 280,000 cars per day travel on Interstate 10 and 175,000 cars per day on Beltway 8 77024 is the wealthiest zip code in Texas and fourth in the nation Memorial has the highest per capita and household income in Houston Located at the intersection of Interstate 10 and Beltway 8, the demographic center of the Houston area