List of road routes in New South Wales

To supplement the National Route number system, three Ring Roads were introduced to Sydney in 1964, symbolised by a blue circular shield with white writing and a dotted outline.

In 1973 Freeway Routes were introduced to complement the state's National Routes and Sydney's Ring Roads, symbolised by blue rounded shields with white writing crowned by red crests as well, in an imitation of the American Interstate shield.

In 2020, the styling of the markers was modified to remove the white border, aligning with the design for all other states and territories except the ACT.

[5] In practice, this means roads allocated an M route are usually at least dual-carriageway motorways or high standard rural highways with at least two lanes in each direction.

[5] B routes are numbered between 51 and 99, with the sole exception of Monaro Highway (allocated to remain consistent across state lines).

– continues east as along Kings Highway into ACT via Kowen, and back into NSW eventually to Batemans Bay New South Wales is currently the only state in the country to use D routes, representing detour routes around nominated motorways (when closed or otherwise unusable).