One big problem with two-wheel motorized transport is the emissions: motorcycles and scooters have horrible emissions. They're also really dangerous. E-bikes

One big problem with two-wheel motorized transport is the emissions: motorcycles and scooters have horrible emissions. They're also really dangerous. E-bikes are becoming really popular though, in some places. They're about the same speed as regular bicycles, but much easier and less tiring (/sweaty) to ride for most people, especially on hills. Here in Tokyo, every mother with small children has one now it seems.