Ok, so be honest, have you ever flashed your headlights at oncoming traffic to warn of a police officer ahead? I witnessed this last night and I wanted to pull that guy over and tell him what my cousin, Jodi once told me that changed my mind about this. Jodi is a DPS officer and has a very strong opinion about doing this.
Somehow we got on this topic during a holiday and he asked us if we ever thought that perhaps the officers were looking for someone. Maybe they were looking for the person that you just flashed. They could be looking for a kidnapper, or murderer and by flashing your lights you may have just warned them and given them freedom to get away. You may have just kept the our officers from protecting you.
So please don't flash warning lights at others. You are not helping by preventing our officers from doing their job.