As you can see they have travelled safely cycling around the world until they reach Thailand. There are so many accidents in Thailand involving Thais and foreigners, most of the time riding motorcycles, that I would not dare take the road on 2 wheels. Peter Root and Mary Thompson underestimated the dangerousness of cycling in Thailand.
Driving a car is already very dangerous and I remember the first time I took the steering wheel here. I was so uncomfortable. I had to learn my way through the traffic being particularly vigilant anticipating drivers’ bad conduct on the road.