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Living in Wisconsin around my area we have a fair sized dear population with the corn fields and a lake all with in a short walking distance so deer population has always been an issue and I have seen many wrecked vehicles (bikes & cars) smashed up that had a deer avoidance system on them. I do not think any of them work worth a darn !
Plenty of deer up this way, and nothing, I repeat nothing, seems to keep them at bay. I've had friends say the stupid deer avoidance devices actually got the deer attention, and startled them into running at them. Just say "no"....
I've done some experiments, from a vehicle, not on a bike. Driving past a group of deer on the side of the road I held a "deer whistle" out the window. The claim is, it emits an ultasonic wave that only the deer can hear, not humans, and it makes them run away. Well they didn't even flinch. Next time I saw some deer ahead I layed on the horn, and made a bunch of real noise. Some flinched and moved away, others lifted their heads to see what was going on.
My opinion: If you can't hear it, neither can the deer.
Having said all that, the deer standing on the sides of the road aren't the ones you have to worry about. It's the ones that are running full flight and bound onto the road in front of you. You don't see them coming, they don't see you, they wouldn't have heard you even if you were laying on an airhorn, they were probably running because they were scared and trying to get away from something. Those are the ones that get killed.
What I always do, I ride down as close to the center of the road as I can, all the way to the left. Then there's equal distance on each side of me, if a deer pops onto the road, maybe I'll have a split second more time to react compared to riding along the right side of the shoulder lane for example.
Rob Zombie blaring out on my stereo and exhaust noise seems to help. I have seen quite a few deer run the other direction when I pass a cornfield on my street glide rumbling along with Rob Zombie. Now for a deer charging across the road, I don't think anything will stop them. They are one of the dumbest animals. Almost as dumb as squirrels. A squirrel could be almost across the road but when it sees you approaching for some reason it has to run all the way back to the side it came from instead of just finishing its crossing.
I hit a deer this year with my truck. It just stared at me as I mowed it down. I had a close call the other day in the snow. I came around a turn and four of them were crossing the road. Lucky me, I applied the brakes and slid inbetween them.
Unfortunately I do not have any info on the Hornet Deer system. I have tried whistles, etc. with no luck. Like I said, loud music and exhaust rumble seems to make them take notice when they are standing but there is nothing that will stop a hard charger.
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