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  2. Level crossing signals - Wikipedia

    en.wikipedia.org/wiki/Level_crossing_signals

    The basic signal consists of flashing red lights, a crossbuck and an alarm (either a bell, a speaker that mimics a bell sound or an electronic siren), attached to a mast. At most crossings, the signals will activate about 30 seconds before the train arrives but there are sensors measuring speed so that the crossing knows when to activate; so ...

  3. Stack light - Wikipedia

    en.wikipedia.org/wiki/Stack_light

    Stack light in automated production for in-line quality inspection. Stack lights (also known as signal tower lights, indicator lights, andon lights, warning lights, industrial signal lights, or tower lights) are commonly used on equipment in industrial manufacturing and process control environments to provide visual and audible indicators of a machine's status to machine operators, technicians ...

  4. Spectral color - Wikipedia

    en.wikipedia.org/wiki/Spectral_color

    A rainbow is a decomposition of white light into all of the spectral colors. Laser beams are monochromatic light, thereby exhibiting spectral colors. A spectral color is a color that is evoked by monochromatic light, i.e. either a spectral line with a single wavelength or frequency of light in the visible spectrum, or a relatively narrow spectral band (e.g. lasers).

  5. Review of Spectrum’s new Xumo streaming box with ... - AOL

    www.aol.com/review-spectrum-xumo-streaming-box...

    To use Xumo, you need to be a Spectrum cable TV subscriber and a Spectrum internet customer. Currently, most Spectrum customers get cable TV access through what’s called a “set top box,” or ...

  6. Charter rolls out new Spectrum pricing and internet speeds ...

    www.aol.com/news/charter-rolls-spectrum-pricing...

    Life Unlimited — a new platform for Spectrum’s internet, mobile and TV services — will roll out across its 41-state footprint this week, the company said.

  7. Spectrum cable introduces a new souped-up ‘cable box.’ What ...

    www.aol.com/spectrum-cable-introduces-souped...

    The new box, called XUMO, replaces the old set-top cable box and has several new features. Spectrum cable introduces a new souped-up ‘cable box.’ What it does, how much it costs

  8. Traffic light - Wikipedia

    en.wikipedia.org/wiki/Traffic_light

    A three-colour signal head should have three non-flashing lights which are red, amber, and green, either arranged horizontally (on the side opposite to the direction of traffic) or vertically (with red on top). A two-colour signal head may be used in temporary operation and consists of red and green non-flashing lights.

  9. AOL Mail

    mail.aol.com/d?reason=invalid_cred

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!