Confused person standing in the middle of the trolley tracks trying to figure out the signs .
There is a very good chance that a person plans their route around San Francisco city on the trolly by studying the signs .
It is impossible that a person plans their route around San Francisco city on the trolly by studying the signs .
There is a very good chance that a person plans their route around San Francisco city on the trolly by studying the signs .
A person plans their route around San Francisco city on the trolly by studying the signs .