OK, so with the twinning of Route 11 NBDOT will be eliminating the cloverleaves at 11/15 and 11/134. I propose eliminating all of them in the province, including 2/15 and 2/16. 16 should be easy, a basic trumpet or even diamond should do. Here is my proposition fro 2/15:
It's a modified design, directly inspired by the 107/118 interchange in Dartmouth (HRM residents, I would appreciate feedback on whether that junction works well). Route 2 runs under instead of over, and new overpasses would be built on Route 15, each carrying 2 lanes of through traffic and 1 lane of the ramps toward Moncton or Shediac. The red lines indicate dividers.
The primary benefit is to eliminate any weaving, which would become a huge issue if Greater Moncton continues to grow or picks up any speed. If Moncton were to receive the same growth 2011-16 as it did 2006-11 (unlikely, but bear with me), the CMA population would then be over 150k, and that's a lot of people who want to go to Parlee Beach, Bouctouche and PEI. This could be a very important improvement when the time comes.