Unbelievable, but true, there is Bamboo Bicycle Training in the Philippines and in Africa as Bamboo grows in Asia, Africa and South America. These bamboo bikes are strong and can support heavy loads.
Bamboo Bike Training in the Philippines
I think that to build Bamboo Bikes is not a very good idea
as it is very difficult to make sure that the joint sticks are strong and don't break. If a bamboo frame breaks the driver may have an horribly accident. However, if you want to build a bamboo bike you should know what you are doing.