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In telecommunications, a stop signal is a signal that marks the end of part of a transmission, for example: In asynchronous serial communication , a signal at the end of a character that prepares the receiving device for the reception of a subsequent character.
Short signal blocks on the Toronto Transit Commission subway system. A train (not visible) has just passed the most distant, leftmost signal, and the two most distant signals are red (stop and stay aspect). The next closest signal is yellow (proceed with caution), and the nearest signal shows green (proceed).
Stop Signal - Stop signals are displayed on Absolute signals, in fact the ability to display an absolute Stop is part of that signal type's definition. Stop is the most important signal as passing a signal at Stop presents a serious risk of accident. Engineers committing a Stop signal violation automatically have their Federal certification ...
A two-head color position signal on a CSXT mainline where the left head displays "Stop" and the right, "Clear" A device that indicates the condition of the line ahead to the driver of a train Signal box A building or room that houses signal levers (usually in a frame), a control panel or a VDU-based control system Signal passed at danger
S5 stop at next signal (1 block free) S1 stop, train ahead: 4-state ABS: S2 proceed (>2 blocks free) S3 proceed (2 blocks free) S5 stop at next signal (1 block free) S1 stop, train ahead: other: S1a is a special-case aspect, which forbids passing a signal displaying it, just like S1 on semi-automatic signals. It is used for safety reasons, for ...
Originally, signals displayed simple stop or proceed indications. As traffic density increased, this proved to be too limiting and refinements were added. One such refinement was the addition of distant signals on the approach to stop signals. The distant signal gave the driver warning that they were approaching a signal which might require a stop.
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The first stop signal controlled by a box is called the home signal. [8] A distant signal is also provided some distance from the home signal, which will only show a clear aspect if all stop signals under a signal box's control are clear, and will otherwise show caution – this gives a driver advance warning of a need to stop.