[Coding_Cat]

Even if all of this is true and then some, it doesn't change the fact that there are very little motorbikes on the road. Switching to these types of roads, even if it were impossible to ride on for motorbikes might still be a net positive for the environment.

[contingencies]

Not really. In much of Asia, which is most of the world's population, two wheelers dominate. Traditionally bicycles, which was followed by motorbikes in South and Southeast Asia and electric scooters in China.

There's a reason why they continue to dominate, and it's not just the cost of cars (I've regularly seen people riding bicycles worth more than many people's cars here in China) - it's because they're practical! Parking, repair, exercise, lack of traffic congestion, etc.