“It is my opinion that the SUV or, as it is sometimes referred to, Large Engine Vehicle, which does so well in the United States, will be a wonderful addition to the various product lines within Vietnam”
Source: https://truthsocial.com/@realDonaldTrump/posts/114784170652465525
And their streets are narrow, especially in the French quarter of Hanoi and other older areas. The vehicles in use currently are often very small to make it easier to navigate the narrow roads (and street/laneway parking) and like you mention - the scooters, which are like 90% of vehicle traffic.