These animal protection groups need to get real. It's not like this road is going to have any volume of traffic on it. It's just going to be a border patrol vehicle once in a while. I've lived around grizzlies/brown bears for over 30 years and I can tell you they don't avoid roads as a matter of preference, in fact they like to use roads themselves. Much easier meandering down a road than fighting heavy brush. I even have a photo I took this summer of a grizzly walking down the Alcan highway near Kluane Lake. The cars didn't bother him at all. there were about 10 vehicles stopped getting pictures of him. I finally went down the road and got ahead of him and stopped and rolled my passenger window down and as he walked by my truck I snapped a picture. He never gave me a second glance.
What does affect their use of roads and areas close to roads is people shooting at them. As long as vehicles full of hunters or I should say poachers aren't using this road, the bears will think nothing of it except for it will be an easy way for them to get around.