page_title: Emergency vehicle lighting
section_title: Information matrix signs
hierarchical_section_title: Emergency vehicle lighting / Optical types / Information matrix signs
caption_attribution_description: English: Tuning World Bodensee 2018 Deutsch: Tuning World Bodensee 2018
context_page_description: Emergency vehicle lighting is one or more visual warning lights fitted to a vehicle for use when the driver wishes to convey to other road users the urgency of their journey, to provide additional warning of a hazard when stationary, or in the case of law enforcement as a means of signalling another driver to stop for interaction with an officer. These lights may be dedicated emergency lights, such as a beacon or a light bar, or may be modified stock lighting, such as a wig-wag or hide-away light, and are additional to any standard lighting on the car such as hazard lights. Often, they are used along with a siren in order to increase their effectiveness.
  In many jurisdictions, the use of these lights may afford the user specific legal powers, and may place requirements on other road users to behave differently, such as compelling them to pull to the side of the road and yield right of way so the emergency vehicle may proceed through unimpeded.
  Laws regarding and restricting the use of these lights vary widely among jurisdictions, and in some areas non-emergency vehicles and semi-emergency vehicles may be permitted to use similar lights.
context_section_description: Some emergency vehicles use signs made up of a large number of light sources (usually LEDs), which can be programmed to display messages to other road users.  This can be used to request other vehicles to pull over, indicate a special instruction, or just to display the name of the operating service (e.g. ‘Police’).
caption: LED Information matrix sign (black surface) on a police car between the beacon and search lights.
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