I’m not sure that the other routes shown are not old Roman routes; Kirkby Thore lay at a Roman crossroad, with the Maiden Way going east to west. Roman Britain really had a lot of stuff to get lost, including whole towns, it’s not surprising that it hasn’t all been figured out.
Looks like they are modern to me. Note the ring highway around London and the routes going into Scotland.
The road going up the coast northeast looks like the enlarged (now) A 12 up to Ipswich. That the A12 keeps going up to, I think, Great Yarmouth.
Resided a couple hundred feet from that road as a
a teenager.
BTW, the A12 followed the medieval; middle ages route of a Roman road to Colchester or maybe beyond IIRC.