If your are in Bangkok and want to travel local then bus is the main travel vehicles. Buses are always safe and low cost to other travel transport. Buses in Bangkok provide an incredibly cheap way to travel from one side of the city to another. It's also a great way to see the real Bangkok you don't often see if you're traveling by other means of transportation. I had a great bus travel experience in USA. I booked online bus tickets from indianapolis to new york and it was very easy to manual booking.