I would not hold any faith in those whistles , I'm sure you know how dumb the white tails are when they spook, you don't know what way they will go when they are on the side of the road. I would be more worried about Elk, or Moose!
Our white tails don't migrate and just live year round in a narrow corridor on the valley floor. They ignore me from 50 yards or so when I'm mowing my lawn on the lawn tractor if my dogs are in the house. They get used to you.
Like Ron White said, some people wake up at 3:00am dress in camo, whisper, pour deer wiz on their boots, have a rifle that fires a projectile at 3000 feet per second and still don't get a deer. Some of us are so skilled we can kill a deer with a mini van!
Its not a matter of "IF" its "WHEN" will you hit a deer when you live this far north! My when has already happened.