Live bridges, grown not built

This is appropriate eco-friendly tech if ever there is such a thing. Of course anywhere else in the world trees grow a bit slower than there, the warm wet jungles of the wettest place on earth.
Rubber tree roots are strung across streambeds, take root on the far bank, and held in place until they are thick enough to support weight.Over time they grow stronger, where a log from a felled tree would rot very soon.
My own neighbour, a cattle farmer here in Ontario, Canada,has a willow tree that fell across a stream with roots still in the ground as a living foot bridge, but that was accidental.