We have relatives in the midwest where they have more deer than cows.
One couple had the deer whistle decades installed years ago and never hit a deer. Another relative couple bought a Harley like their relatives with the deer whistle. They didn’t buy a whistle and had a couple of close calls. Then, they and a 200# white tailed tangled. He ended up in deer heaven and they ended up in the ER and later an OR. They limp a little and can predict rain or snow storms with their deer injuries. They did not remember seeing the deer hit them. It was probably running fast and right into their Harley it happened after dark.
When they got their new replacement Harley, their relative installed a deer whistle on it and then installed deer whistles on their vehicles. That was over a decade ago and their Harley and vehicles have remained deer free with the whistles.
Just last night I had a very near miss with a probably 8 point buck but it was in a golf cart. Iam a security guard at a very large RV park converted into a cottages condominium and was patrolling the streets in the cart at 1 AM. A whitetail was suddenly running right at me from dead ahead. He wasn’t attacking, I think, because he had his head up and I don’t think he had noticed me. He broke to the side and went by me at the last possible instant. The golf cart is not fast enough for a deer whistle to be effective.
Hereabouts the white tails are little critturs. Few go over 100 pounds.