G. The coloured arcs on the ASI are not unique to Cessna and are sensibly used by many manufacturers to comply with FAA regulations in that they placard and place right in front of the pilot vital limitations such as flap limit, manoeuvring, VNE, stall and other speeds and on the twins much more. Having flown most Beech, Cessna and Piper SE and ME aircraft I have found the coloured arcs a great safety feature. You would be surprised how many of these aircraft regularly cruise high in the yellow arc and the owners still use them in air races and just as I predicted one twin owner bent his wings. The flight manuals for many older UK certified aircraft often refer the pilot to the BAFM or stick a placard up out if sight in the wing root.