I've never hit a badger but as i live out in the sticks the real car wreckers are deer!
I was in my brother's suzuki alto (yes it provides constant banter) and we hit one so hard it basically crippled the car and the deer.
After phoning the police about what to do with it (as it was writhing about in the road) the warden phoned us back and instructed us to hit it hard over the head until it was dead and throw it onto the verge as he was caught up in something else at the time....
It was a horrific experience and I have never eaten venison since...