A head up display (HUD) system includes: a difference module configured to determine a speed difference based on a difference between (a) a present speed of a vehicle and (b) a target speed of the vehicle; a light source configured to, via a windshield of the vehicle, generate a virtual display that is visible within a passenger cabin of the vehicle; and a display control module configured to control the light source to include a visual indicator of the speed difference in the virtual display.