21. Japan issued guidelines for such warning devices in January 2010 and the US approved legislation on December 2010. 22. A "'train horn "'is a powerful air horn that serves as an audible warning device on switching operations. 23. Swissair spokesman Erwin Schaerer said a collision with the KLM plane was avoided thanks to electronic warning devices . 24. Local engineers will, however, have to request warning devices by type and location before any action is taken. 25. Human observation and the lightning warning device , used about 40 minutes earlier, had removed that notion from his mind. 26. Dedra Shanklin's lawsuit against Norfolk Southern invoked Tennessee law and said the railroad failed to install adequate warning devices . 27. The pilots of both planes reported that their collision warning devices went off, forcing them to take emergency measures. 28. A prototype warning device already in early stages of development may be ready for testing within two years, they said. 29. The early warning devices were a critical part of evacuation plans for residents near the volcano during the current rainy season. 30. Just before the crash, the Conrail engineer had used marijuana and had intentionally disabled an audible warning device in his cab.
