> for example, how do you see the lane markers so that you stay in your lane? As a human in a snowy region, who has been in some pretty dicey conditions, I mea

> for example, how do you see the lane markers so that you stay in your lane? As a human in a snowy region, who has been in some pretty dicey conditions, I measure the slope of the road. Roads are typically shaped like a triangle, so if your car changes it’s rotation on the axis that is your direction of travel, you know you are outside of your lane. Even my smartphone has sensors for that kind of measurement.