**A new Road Numbering System** The NSW Government has made significant improvement to how motorists can find their way across NSW. Transport for NSW has implemented a new system of alpha-numeric route numbering. This dataset provides you with the important changes to NSW, and additional information regarding the program. **Route numbers and road names** The existing 'shield' route markers have been replaced with a combination of a letter - either an M (motorway), A (route of national significance) or B (route of state significance) - and a number from 1 to 99. **NSW Route Number Map**