People usually gave their townland or occasionally their parish as the place they came from. Road names and house numbering only came to rural Ireland in the 1950s and prior to that your townland was all that was needed to get a letter delivered to you or otherwise identify where you lived. No townlands ended in the word road as far as I am aware so I doubt that’s what your William’s was. You can see a complete list of all the townlands on the attached list:
People born outside of England and Wales were actually only required to put the country of birth (not the actual location) in the censuses so you are lucky in a way that you got the Lisburn information.