In Indiana, it is law that you turn on your headlights if you are driving in rainy conditions. While most of us know and abide by this, it seems to still be lost on some. Indiana State Police Sergeant Todd Ringle made a social media post reminding motorists of the importance of driving with headlights in rainy conditions like we've had lately in the Tristate. While you may be able to see just fine to drive, the reason you should have your headlights on is actually to make you and your vehicle more visible to other motorists. The cliffnotes here is: Don't be a dummy. Turn on your headlights.