I'm guessing 6 to 12 inches, but the shock of this hateful behavior made it hard to know how close she was. Local PD was very responsive and let me know that they contacted this driver (no charges, only a warning).

But to my point, this is the primary purpose for the action camera on my bikes. I've seen too many dangerous/hateful drivers put my life and my friends/family lives in peril. At $400, it's a cheap way to improve road safety and save lives. Reading this post from a friend of a friend, or watching a hateful driver scream obscenities while trying to force my wife off the road.... These things reinforce how much value a good action camera has. I've only used my GoPro on commutes, and I want to set up to use it on all my rides. So, I'm looking for a small-form camera with a quick-release to mount on a variety of bikes.