lateral illumination

On some models, white "cornering lamps" provide extra lateral illumination in the direction of an intended turn or lane change.

See also "From Lateral Illumination to Slit Lamp - An Outline of Medical History"

Dipped-beam (also called low, passing, or meeting beam) headlamps provide a light distribution to give adequate forward and lateral illumination without dazzling other road users with excessive glare.

"Lateral Illumination" in "System of the Diseases of the Eye" edited by Norris and Oliva, Philadelphia, 1897.

Low beam (dipped beam, passing beam, meeting beam) headlamps provide a distribution of light designed to provide adequate forward and lateral illumination with limits on light directed towards the eyes of other road users, to control glare.