The blue bus is the most common and connects suburban districts to the urban parts of Seoul. The blue represents Seoul's skyline and the Hangang and symbolizes security and freedom.
The green in the green bus represents the mountains surrounding Seoul and connects major subway stations or bus terminals in Seoul.
The yellow bus stops at major railway stations/bus stops, tourist areas, shopping areas and business areas. The yellow represents friendliness.
The red bus (a.k.a. express bus) connects neighboring cities to Seoul. The seats are more comfortable as it runs longer distances but it is more expensive.
The maeul bus is smaller in size and runs shorter routes in residential areas.
(There are sometimes buses with faces on them called tayo buses. They are the same except they have faces drawn on them. There is also the airport limousine bus and Seoul City Tour Bus.)
Tips for riding buses:
You can pay your fare by paying in cash or through a transit card. However when paying in cash don't use bills larger than 5,000 won as it could be hard to get change. When using a transit card, you must scan it when you get off as well.
When getting off the bus, you need to press the stop buzzer when the bus is approaching your stop.
