when you drive south on the A1 the sun is continually to the left, the right, in your eyes, because you go from town to town via the various town bypasses built in the '60s... Vs the M1, which was planned from scratch as a main north bound route out of London, in a basically straight line.
As an anorak, it's close to my heart as I live on a town on 'The great North Road', Doncaster, a good Roman settlement... not many Romans about now y'know.
I had only ever heard of Erime Street click here and that would proberby of been my answer (yes I know its only two words).
Interesing to see that in the link I gave above, under 'The alternative course of Ermine Street' it says 'this road formed what for many later centuries became 'the Great North Road' (lower case 'the') not The Great North Road (capital 'The')
I'm rubbish at English and you can all point this out if you wish, but she could be right!