Public transportation provides several benefits. It eases traffic congestion by providing transportation alternatives to driving. For every $10 million invested in public transit, more than $15 million is saved in transportation costs. Public transit also helps promote cleaner air by reducing automobile use and the associated air pollution. However, some drawbacks of public transportation include lack of privacy and personal space as travelers are crowded together. It also may not be convenient if it does not directly match someone's travel needs due to its fixed schedules. There are also sometimes concerns about lack of space for luggage or strollers. Overall, public transportation can help reduce traffic and pollution but may not be as convenient as personal vehicles for some travelers.