How do I use the Bus Stop/Buses?

At level 10, you unlock the first Bus Stop and the first bus- the Woodeye. You can purchase the Bus Stop for 880 coins and place it on a road nearby a City. You will also need to purchase a Woodeye for 2,900 coins. After you have placed the Bus Stop, you will start receiving Passenger requests at your Cities. Using your new Woodeye, you can start to "deliver" the Passengers from the Bus Stop to the City in the same fashion you deliver regular requests.