| 21. | The STOP signal is a hand held face up in the direction of the child entering.
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| 22. | No one was hurt the first two times commuter train engineer John DeCurtis went past stop signals.
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| 23. | Current train-control systems can limit speeds or stop a train if an engineer ignores a stop signal.
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| 24. | The system stops trains in advance of any other train traffic, and before stop signals at interlockings.
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| 25. | The engineer had disregarded a stop signal.
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| 26. | A single signal may be equipped to function both as a stop signal and a distant signal.
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| 27. | At first, medical sources said that one of the train drivers overlooked a stop signal, causing the crash.
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| 28. | Actually, the diplomat exaggerated : There are no stop signals in the Serb capital and hardly any traffic.
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| 29. | Teachers should not keep track of the number of times they give out the GO and STOP signals.
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| 30. | Where signals are closely spaced, a stop signal and a distant signal can be mounted on the same post.
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