<human>:  What are the pros and cons of using public transportation?
<bot>: 

Pros:
1. Cost-Effective: Public transportation typically costs less than taking a taxi, renting a car, or driving your own vehicle.
2. Environmentally Friendly: Public transportation reduces emissions and helps to decrease pollution levels in cities.
3. Convenient: Public transportation is often the most convenient form of travel, as it provides easy access to all areas of a city or region.

Cons:
1. Unpredictable Schedules: Public transportation is not always reliable, as the schedules can be affected by traffic and other unforeseen events.
2. Crowded Bus or Train: Public transportation can be overcrowded during peak hours, which can make it uncomfortable for riders.
3. Safety: Public transportation can be risky, especially late at night or in certain neighborhoods.