(b) Photograph of the ITO / L / H / PET substrate during the bending test at minimum width of 40 mm. (sciencedaily.com)
If so, you may desire a car seat with minimum width. (mommystroller.com)
And (b), there is a provincial policy that sets 1200 mm (4 feet) as the absolute minimum width, but it is really supposed to be 1500 (5 feet). (treehugger.com)