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Red is usually danger, so traffic lights include red ones.

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endanger    danger   endangered    dangerous  
in danger    in dangerous    be in danger    be in dangerous  
sign  substitute  proof  target  
red flag was placed there as a token of danger. sign  substitute  proof  target  
substitute  sign  proof  target  
Action!    Danger! Keep out!    No photos!    No parking  
PULL    CLOSED   DANGER    FRAGILE  
Red.  Green.  Yellow.  Black.  
combine  join  associate  relate  
indicates the limits of the navigable channel  indicates a danger area  is used to identify the characteristics of the light  serves no significant purpose"  
sign  substitute  proof  target  
technical  electronic  physical  chemical  
Red.  Green.  Yellow.  Black.  
worn    had    dressed    put  
sign  substitute  proof  target  
endanger    danger    endangered    dangerous  
Indicates the limits of the navigable channel  Indicates a danger area  Is used to identify the characteristics of the light  Serves no significant purpose  
horizontal  wavy  diagonal  upright  

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