Traffic Light Signal - Red, Amber, Green Lights Explained #3242395 (License: Personal Use)

This high-resolution image shows a classic three-light traffic signal mounted vertically on a pole. The top red light is illuminated, featuring a honeycomb lens pattern for optimal visibility; the amber (yellow) and green lights remain off. The housing is black metal with visible mounting screws and protective visors over each lamp.

Used on transportation, traffic engineering, or driver education web pages to illustrate signal operation, road rules, or infrastructure design. Matches user intent for learning how traffic lights work or visual reference for signage standards.