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New story on the Northridge Metrolink crash.
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3>Items #1, 2, and 3 are not the same thing.<SPAN style="mso-spacerun: yes"> </SPAN>By item #1, I am referring to the ability to pass a vision test and a color blindness test.<SPAN style="mso-spacerun: yes"> </SPAN></FONT></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3><SPAN style="mso-spacerun: yes"></SPAN></FONT> </P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3><SPAN style="mso-spacerun: yes"></SPAN>By item #2, I am referring to the need to observe a signal, as opposed to not observing it due to distraction or intentional failure to look at the signal.<SPAN style="mso-spacerun: yes"> </SPAN></FONT></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3><SPAN style="mso-spacerun: yes"></SPAN></FONT> </P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3><SPAN style="mso-spacerun: yes"></SPAN>By item #3, I am referring to the mental process of recognition whereby a person might see a red signal as green simply because they expected a green signal, for instance.<SPAN style="mso-spacerun: yes"> </SPAN>This item # 3 is what the article is exploring.<SPAN style="mso-spacerun: yes"> </SPAN></FONT></P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3><SPAN style="mso-spacerun: yes"></SPAN></FONT> </P> <P class=MsoNormal style="MARGIN: 0in 0in 0pt"><FONT face="Times New Roman" size=3><SPAN style="mso-spacerun: yes"></SPAN>So all three items, plus item #4, are different from each other.<SPAN style="mso-spacerun: yes"> </SPAN>The lack of any one of them could result in a crash.<SPAN style="mso-spacerun: yes"> </SPAN>You have actually added 5<SUP>th</SUP> item, which might be a subset of item #3.<SPAN style="mso-spacerun: yes"> </SPAN>That is that the engineer must possess the knowledge of what the signal aspects mean.<SPAN style="mso-spacerun: yes"> </SPAN>Therefore, I will amend my list as follows:</FONT></P><FONT size=3><FONT face="Times New Roman"> <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></FONT></FONT><FONT size=3><FONT face="Times New Roman"> <o:p></o:p></FONT></FONT> <P class=MsoBodyText style="MARGIN: 0in 0in 0pt 0.5in; TEXT-INDENT: -0.25in; tab-stops: list .5in"><FONT face="Times New Roman"><SPAN style="COLOR: #545454"><FONT size=3>1)</FONT></SPAN><SPAN style="FONT-SIZE: 7pt; COLOR: #545454"> </SPAN><SPAN style="COLOR: #545454"><FONT size=3>Engineer must possess the visual capability of recognizing a signal aspect.</FONT></SPAN></FONT></P> <P class=MsoBodyText style="MARGIN: 0in 0in 0pt 0.5in; TEXT-INDENT: -0.25in; tab-stops: list .5in"><FONT face="Times New Roman"><SPAN style="COLOR: #545454"><FONT size=3>2)</FONT></SPAN><SPAN style="FONT-SIZE: 7pt; COLOR: #545454"> </SPAN><SPAN style="COLOR: #545454"><FONT size=3>Engineer must observe a signal.</FONT></SPAN></FONT></P><FONT face="Times New Roman"><SPAN style="COLOR: #545454"><FONT size=3> 3)</FONT><SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN></SPAN><SPAN style="COLOR: #545454"><FONT size=3>Engineer must recognize the signal aspect.<o:p></o:p></FONT></SPAN></FONT> <P class=MsoBodyText style="MARGIN: 0in 0in 0pt 38.25pt; TEXT-INDENT: -20.25pt; mso-list: l0 level1 lfo1; tab-stops: list 38.25pt"><FONT face="Times New Roman"><FONT size=3>4)</FONT><SPAN style="FONT: 7pt 'Times New Roman'"> </SPAN><FONT size=3>Engineer must know what the signal aspect means.</FONT></FONT></P> <P class=MsoBodyText style="MARGIN: 0in 0in 0pt 38.25pt; TEXT-INDENT: -20.25pt; mso-list: l0 level1 lfo1; tab-stops: list 38.25pt"><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">5) Engineer must respond to the aspect.</SPAN></P>
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