My Concepts for a PTH 1A Kemnay Truck Bypass
For an initial design, I'd realign PTH 1A on the Mile Road (Road 117W) to connect with TCH 1. The current Intersection would be closed off in order to reroute traffic away from Kemnay. Whereas the new Intersection would be upgraded to accommodate slip lanes on and off of the TCH. The Railway Crossing would be left as at-grade. The Intersection just East of the underpass would have a turning lane to direct trucks North towards TCH.
The Ultimate Design could be used in the future when/ if PTH 110 gets extended from Brandon South to PTH 1/1A. It would have a Diamond Interchange with TCH 1, along with a Service Road connecting PTH 1A to Kemnay, ultimately shutting down the old underpass.
Disclaimer: These aren't official drawings, these are just my concepts. While they're not perfect solutions and obviously pie in the sky, they're just ideas that the Highway Department could take notes from.