The modern automobile is a microcosm for our networked society. Everything from the brakes to the dual-zone climate control and from the windscreen wipers to the CD player is connected through a Controller-Area-Network (CAN) bus.
Like the nerves in our bodies, this network passes information from one component to another. It allows the anti-lock brakes and electronic stability control to work in unison, disconnects the cruise control when you step on the accelerator and allows the headlights to switch themselves on in low light conditions.
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