NB TCH Rte. 16 (Aulac to Confederation Bridge) will
never be twinned. As
Bedford DJ stated, there are no twinned highways on PEI and the Confederation Bridge itself is a two lane bottleneck.
That being said, traffic to PEI can be
very heavy in the summertime and some upgrading work is necessary.
Most traffic to the Island actually travels on NB Rte 15 (Moncton to Port Elgin); where it then joins up to Rte. 16 (the TCH). This road also handles commuter traffic into and out of Moncton. This highway is already twinned between Moncton and Parlee Beach (at Shediac) and likely should be twinned as far as Cap Pele (a distance of about 40km). Beyond this, I can envisage putting in passing lanes to help with summer congestion but twinning would not be justifiable.
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On a separate note, I drove along the new divided TCH in the Upper Saint John River Valley for the first time this week...... What an absolute delight!!!!
I was expecting something similar to the TCH between Moncton and Fredericton; which has been built through forested lands, avoiding nearby farmlands, and helps to convey the impression that New Brunswick is composed only of moose and muskeg.
The new segment however meanders through farmlands, past small towns and over ridges of the Appalachian Mountains with numerous scenic vistas to be had. It is actually much prettier than the old non-divided TCH route through the same area. The new highway is safe, secure and scenic. My hat off to the engineers!!!!