I don't think you're going to find that in the Census data or even on sites like https://data.bts.gov/ . However, you might want to look at any local transportation departments that often analyze road planning.
To obtain statistics on intercity travel frequency, you can explore transportation databases, state agencies, or utilize platforms like the U.S. Department of Transportation. Websites such as traffic monitoring agencies or toll authorities may provide specific data on routes like IH-4 between Tampa and Orlando, shedding light on the frequency of trips made between these cities.
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