Continuing the discussion from Mapillary mount useless:
I came to the same conclusion but for other reasons. In addition to the vibration issue, pictures made with a handlebar mounted camera are not made in the driving direction but in the front wheel direction. As the front wheel is advancing on a sinuous line most of the pictures are taken to the left or right of the general driving direction, in particular when you drive uphills. This results in a vertiginous effect when viewing a sequence of such pictures.
To avoid this effect, I am looking for ideas for a chest mounted solution, either ready to use or requiring some bricolage.