I can only speak about "down in the delta" as it is some 20 years since I was last in Hanoi.
South of the Mekong, the ENTIRE area is "built-up" and urban by Western (well, Australian, at least) standards, and the highest legally permitted open-road speed I saw sign-posted for motorcycles was 60 kph, with some areas posted as 40 kph.
We rode two-up on a variable-speed step-through of 132 cc capacity, and were able to blitz the locals away from the traffic lights. (I am over 100kg, so the little 132 has some two-up weight penalties as we sped away from the cowds at the lights...)
Cheers
John
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