Indicator lights, also known as signal lamps, provide visual warnings and information to the driver regarding vehicle status and intended maneuvers. These lamps are integrated into the vehicle’s exterior lighting system – typically the front and rear fascias, and side mirrors – and internally within the instrument panel. Operation relies on low-voltage electrical circuits activated by sensors, switches, or the vehicle control unit. Common indicator types include directional, hazard, malfunction, and low-fluid warnings, utilizing incandescent, LED, or halogen bulb technologies. Housings are constructed of durable plastics resistant to impact, temperature extremes, and UV exposure, with standardized bulb/connector interfaces for ease of service. Signal intensity and flash rate are governed by SAE/DOT standards for visibility and regulatory compliance.