The fastest, most efficient, and safest form of transportation in Guangzhou requires you to go underground. Yes, the subways can be overcrowded during rush hour... and you have to be careful about "pick pockets". However, they are a much better alternative than dealing with the madness above you (cars, buses, taxis, traffic jams, collisions, pollution, etc). The subways in Guangzhou are an extension of the MTR system in Hong Kong. They are clean, efficient, and temperature controlled... wish Boston had subways like this when I lived there.