Watling,Icknild or Ricknild, Ermin and Fosse
where all major what? in Roman Britain?

They are all major Roman streets of Brittain.

And
Q. What's the difference between the Roman roads and modern British ones ?

A. The Roman ones have lasted until today.

Very True Fred Some roads laid in the 60's near where I live are worn out yet I go walking on the moors and there are still intact Packhorse routes that are still navigable from the 16th/17th centuries and they were the "Motorways" of their era