Huawei P20 lite User Manual page 66

Tail Light Trails: Capture the Lights of the City
Tail light trails lets you create artistic photos of car tail lights at night.
Shoot from a distance and slightly above your subject for best results. Ensure that car
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headlights do not point directly at the camera, as this can overexpose the image.
Position your device on a tripod so that it does not move during the exposure.
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Open Camera. Swipe right on the screen and then go to Light painting > Traffic trails. Hold
your Phone steady, and then touch
viewfinder. Touch
to start shooting. A preview of the image is displayed in the
when you are finished.
Camera
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