[eternallyme]

Looking at traffic counts, 104 should definitely be twinned up to Port Hastings before significant re-alignments on Cape Breton are necessary (the entire mainland section should be twinned ASAP - they should aggressively pursue a twinning of the entire remaining mainland section plus the Canso Causeway bypass). Once that is done, Cape Breton can begin to be conquered.

Existing 105 could even be downgraded and renumbered as Trunk 5 once 104 bypasses it from Port Hastings to the CBRM, since no part of it is a freeway and most of it is a rural arterial highway.

I do agree the existing Canso Causeway should be maintained as Trunk 4 for local traffic, since otherwise for local vehicles from Auld Cove to Port Hastings, it is a long way out to the two exits necessary.

The new 4-lane bridge/causeway could also be tolled until the cost is paid off, but in that situation, trucks would be banned from the existing causeway.