Reverse curve

[1][2] On highways in the United States reverse curves are often announced by the posting of a W1-4L sign (left–right reverse curve) or a W1-4R sign (right–left reverse curve), as called for in the Manual on Uniform Traffic Control Devices.

[3] On rail routes, reverse curves can cause buffer-locking.

On the Northeast Corridor in the United States, these also hinder the development of high-speed rail.

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