List of former Baustralian highways
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- Highway 6 – County Road 2 into Cascadia.
- Highway 6A – Highway 6 into Concord.
- Highway 6B – County Road 40 to Highway 6.
- Highway 10 – Assumed by Highway 9.
- Highway 11 – Assumed by Highway 9.
- Highway 19 – Downgraded to Colonial Road 46.
- Highway 20 – Downgraded to Colonial Road 45.
- Highway 21 – Downgraded to Colonial Road 1.
- Highway 22 – Downgraded to Colonial Road 2.
- Highway 23 – Downgraded to Colonial Road 3.
- Highway 24 – Downgraded to Colonial Road 4.
- Highway 25 – Downgraded to Colonial Road 5.
- Highway 26 – Assumed by Highway 8.
- Highway 27 – Assumed by Highway 53.
- Highway 29 – Assumed by Highway 8.
- Highway 30 – Downgraded to Colonial Road 22.
- Highway 31 – Returned to original Highway 6A designation.
- Highway 32 – Downgraded to Colonial Road 32.
- Highway 33 – Downgraded to Colonial Road 67.
- Highway 33A – Redesignated
Highway 6A Aux. - Highway 33B – Redesignated
Highway 6A Bus. - Highway 34 – Assumed by Highway 8.
- Highway 37 – Assumed by Highway 34.
- Highway 38 – Downgraded to Colonial Road 1.
- Highway 39 – Assumed by Highway 38.
- Highway 40 – Assumed by Highway 38.
- Highway 41 – Downgraded to Colonial Road 2.
- Highway 42 – Downgraded to Colonial Road 3.
- Highway 43 – Downgraded to Colonial Road 11.
- Highway 44 – Assumed by Highway 43.
- Highway 45 – Downgraded to Colonial Road 12.
- Highway 46 – Downgraded to Colonial Road 13.
- Highway 47 – Assumed by Highway 46.
- Highway 48 – Downgraded to Colonial Road 14.
- Highway 49 – Partially assumed by Highway 50, remainder deleted.
- Highway 50 – Downgraded to Colonial Road 100.
- Highway 54 – Assumed by Highway 21.
- Highway 55 – Highway 21 to Cannifton House.
- Highway 56 – Downgraded to Colonial Road 23.
- Highway 57 – Colony of Fox Islands dissolved.
- Highway 58 – Colony of Fox Islands dissolved.
- Highway 73 – Downgraded to Colonial Road 52.
- Highway 74 – Downgraded to Colonial Road 12.
- Highway 75 – Downgraded to Colonial Road 24.
- Highway 76 – Downgraded to Colonial Road 33.
- Highway 77 – Downgraded to Colonial Road 6.
- Highway 78 – Downgraded to Colonial Road 11.
- Highway 79 – Downgraded to Colonial Road 16.