hit 1...avoided about 100.
Best advice I have is if you see them take your foot off the accelerator and steel yourself not to swerve...it is too hard to correct yourself out of a jerking swerve.
Deer whistles are the greatest invention ever....for the inventor. If you never hit one, then they must work. If you do, well, what did you expect for 5 dollars.
strange thing I did notice for a 6 year period I had an old inherited Chrysler with locking wheel covers. The wheel covers where a mess, so I took them off, but left the connecting plate on...no particular reason why, I think I was always going to get new wheel covers but never did.
Anyway, to drive from where I live in Virginia to Winchester it is 58 miles of deer teritory. For some reason during those 6 years a deer NEVER crossed the road in my vicinity. I think it was the clanking and at higher speeds the whirring of those plates. Just a theory, but during the day i would see them stand motionless as I drove past. Maybe that noise was something of a warning to their senses.
Hope this helps.