Mopeds are the preferred form of transport here because cars are heavily taxed on import. Hanoi, for example, has a predominantly moped-based transport system, whilst Saigon (much richer) has more cars. If you see a car in Hanoi, it’s likely to be a Bentley or a high-end Mercedes belonging to a Party bigwig. In richer Saigon, it’s harder to know for sure.
Most interesting to me is how the moped has become more than just a commuter bike, but has also become:
An all-purpose transporter, this being one of many loads (look at the gallery at the bottom for more examples):