Signage improvements: Turn signs for One Way and Dual Carriageways revisited

Following the feedback and comments I have received on a previous article, "Signage improvements for mandatory direction and turn signs", and having thought about this some more, I have had some more thoughts and alternative ideas for the turn signs, one way roads, and dual carriageways.

Motorroads / Expressroads / Expressways and making Dual carriageway ahead symbolic

Following feedback received for "Improvements for UK speed related signs", especially for the Motorroad / Expressroad part, and having had more thoughts about this topic, I decided to revisit Motorroads / Expressroads. And on a loosely related note, I also believe that all of the wordy "Dual carriageway ahead" signs should be replaced with symbolic equivalents, whether or not the dual carriageway in question is a motorroad / expressroad.