Yes, Bangkok's traffic is notorious - with good reason. It's very easy to get caught up in gridlock traffic any time of the day or night, and waste a lot of valuable time in the process. However, with excellent and modern public transport systems in place, Bangkok is surprisingly easy to navigate your way around.
The Skytrain (BTS) and underground (MRT) rail systems connect the main shopping, entertainment and business areas of the city, while river taxis and express boats can be used to explore many historic sites and attractions at the riverside. Taxis are cheap and appear on virtually every corner at almost any time. Tuk-tuks, once a big Bangkok attraction, are slowly disappearing in favour of more comfortable transport, but are still worth a ride at least once.