Route, no motorways or dual carriageways.

May be she doesn't WANT to 'fix' the problem?! May be she isn't inerested in some patronising driving instructor telling her that her fear is 'irrational?!' Perhaps his wife only learnt to drive to do the school run and collect the weekly shop and is usually more than happy driving round town where it causes her no problem! In which case, what is wrong with her wanting a rural route for a one off trip?

Personally I think if you are cautious of mororways maybe you should avoid them. I don't mind dual carriage ways at all, but I can see how some are set out like motorways, and most of us who don't like these major roads, don;t like them because of the slip stream of getting on, not actually being ON the road. I hate motorways, use them very rarely for this very reason, and would happily take a longer route! I would how ever go on a dual carriage way, many of them are on by round about, and those which aren't are rarely as busy as a motorway; thus there is little filtering in to the traffic required.
But if she doesn't like dual carriage way either? Well that's her perrogative. I hope she finds a nice, easy pleasurable drive rather than putting her self under undue stress. And I hope she never takes those stupid motorway driving lessons; they did me no good at all! Whooppee so you feel comfortable driving on a motorway with someone next to you making and confirming decisions... how on earth does that help once you're out on your own??? I think it's just a case of waiting til you're a more confident driver, or, if you plain don't like it... get a good sat nav :-D Mine is well trained to avoid Motorways, lol.