In addition, public transportation (train and metro in particular, it's less true for bus) will give you a predictable time of arrival. You know that by taking

In addition, public transportation (train and metro in particular, it's less true for bus) will give you a predictable time of arrival. You know that by taking this train, you'll arrive at your destination by that time. With you personal vehicle, you might be stuck in traffic, have to circle before finding a spot or find a spot much farther than you expected and have a longer walk to do.