I used to think that it is insane but after driving here for 5 years, you get into the mindset of
1. Never think you know anything about the intentions of other drivers, indicators are used for thanking not turning.
2. No matter what BMW/Audis can defy the laws of physics when braking, especially older models with baked bean cans for exhausts.
3. If you think have enough space in front of you, then a car will fill it.
4. Speed limits are advisory, especially for BMW and Audis.
5. Latvians are great winter drivers considering the state of the road surface.
6. Do not expect or grant courtesy to any driver on the road unless they are police or you are going to crash into them otherwise.
Apart from that, once you get to grips with the fact you should be able to infer all knowledge of speed limits, turning priority from a white sign 5 kilometres earlier, it's fine.