Maybe you need to get somewhere fast at night; public transport doesn't usually run all night. Also, you might find your commute to work requires multiple hops.

Maybe you need to get somewhere fast at night; public transport doesn't usually run all night. Also, you might find your commute to work requires multiple hops. Public transport might be crowded to save costs, and that might be terrible if you are pregnant or need to take someone elderly somewhere. Taxis are expensive and some drivers are dishonest. I've had people tell me they were abused by taxi drivers.