During this holiday week in which many people will be traveling, we present some market sizes for travel, measured in the number of passenger-miles traveled by different modes of transportation. Today, the miles we travel on highways in passenger cars (56.8% of the total), motorcycles (0.4% of total) and what the Department of Transportation calls “other 2-axle, 4-tire vehicles” (42.8% of total).

Geographic reference: United States
Year: 2008
Market size: 4,493 billion passenger-miles
Source: “Table 1-37: U.S. Passenger Miles (Millions),” Bureau of Transporation Statistics, National Transportation Statistics, available online here.