Below from the course description. When looking at he elevation profile it has the no passing zones marked. Looks like around the 2km mark, the 66km mark, and 84 km mark. I apologize if this was already discussed. I'm guessing it is response to the horrible crash that occurred in last year's race?
Bike
You will begin your journey on Montée Ryan to reach Route 117, and, after entering downtown Ville de Mont-Tremblant for a turn-around, you will find yourself back on Montée Ryan and Chemin des Voyageurs, passing the Tremblant Resort and going toward the Municipality of Lac-Supérieur on Chemin Duplessis. Here, you’ll notice that the landscape becomes wilder alongside the river. Before long you will face the most challenging elevation change of the circuit with a maximum grade or 8% and beautiful descents on the way back where you can reach speeds of 60 km per hour, a little rest on the legs before starting your second loop.
**2017 NEWS No Passing Zone on Beauvallon Bridge and Chemin Duplessis
Originally from: http://www.ironman.com/...e.aspx#ixzz4fCMyTHF2
Bike
You will begin your journey on Montée Ryan to reach Route 117, and, after entering downtown Ville de Mont-Tremblant for a turn-around, you will find yourself back on Montée Ryan and Chemin des Voyageurs, passing the Tremblant Resort and going toward the Municipality of Lac-Supérieur on Chemin Duplessis. Here, you’ll notice that the landscape becomes wilder alongside the river. Before long you will face the most challenging elevation change of the circuit with a maximum grade or 8% and beautiful descents on the way back where you can reach speeds of 60 km per hour, a little rest on the legs before starting your second loop.
**2017 NEWS No Passing Zone on Beauvallon Bridge and Chemin Duplessis
Originally from: http://www.ironman.com/...e.aspx#ixzz4fCMyTHF2