My wife has similar lights in her Equinox, so I'm guessing that the functions would be similar.
In her car, the curved road is the lane departure or lane assist warning. Drifting near the lane markers or changing lanes without the turn signal will set hers off.
Likewise, at least in this particular Chevy, the little car in the road is forward distance/collision warning. If you're at a safe distance, it's green. If you're following too close for a given speed, it will turn yellow. If you're getting too close, it goes red and sounds an alert. I don't know if hers automatically applies the brakes, but some systems do, FWIR.
More accurate descriptions may be buried somewhere in the owner's manual, but you may have to dig around a bit.