Among the obvious signs that the headlights are not properly geared is the fact that cars crossing them flash their headlights to signal that your lights are blind, or the fact that the road to be walked is heavily illuminated for only 6 meters or down there, which means that the headlights are turned too far down.
But a wrong orientation of the car’s headlights is not your fault. Any problems with suspensions or heavy loads may also change the trim of the vehicle and slightly shift one or both headlights, perhaps perfectly aligned previously. A collision with a pebble on the road is able to move an optical array and misalign the lights.
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