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In these days of the internet, the flow of information is often described in terms of traffic. Traffic analogies are also common in the study of neuroscience, where information flow is bidirectional as in a two lane highway. This means that information travels both from the nervous system to the rest of the body as well as from the body to the nervous system.

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In the case of the central nervous system, the two-lane highway can best describe the directionality of the efferent nerves (sending signals from the brain to the body, particularly for motor control) and afferent nerves (sending signals from the body to the brain, particularly for sensory input).

So, yes, in this respect, it can be likened to a two-lane highway.

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