Cool if it works. 45 years of driving in rural Wisconsin with no deer hit...then, in one year, I hit five in separate incidents.
I hit a deer in a Jeep once at about 40 mph. Its head exploded like a clay pot, and a piece flew in through the side window and into my mouth. In case you’re wondering, it tasted sandy.
Rut season was amazing here in NC this year, it was not unusual to see groups of deer crossing the road in urban areas, in broad daylight. I’d never hit a deer despite a lot of rural night driving until last year. Fortunately minor, weather was bad with lots of standing water so I was moving fairly slowly. Knocked a foglamp off, crazed the paint on the bumper. The deer skidded on it’s side on the pavement, hopped up, shook itself off and leapt off into the woods.
Many swear by those deer whistles. It’s a common sight to see them mounted on car and truck bumpers here. The effectiveness of them is suspect in my opinion, though, so I’ve never used them.
Even in Wisconsin, do-gooders whine and cry about "killing Bambi". If you eliminate all the natural predators (coyotes, wolves, &c.) the deer population explodes and they become a royal pain as they expand their range into urbanized areas. The only good answer is to thin the herd with annual hunts.