Visible is a synonym of Appear. Appear is related to Sudden. Sudden is related to Flash. 
Limit is related to Highway. Highway is related to Bridge. you are likely to find Steel in/at/on Bridge. Steel is related to Bar. 
Visible <--Synonym--> Appear <--RelatedTo--> Sudden <--RelatedTo--> Flash 
Limit <--RelatedTo--> Highway <--RelatedTo--> Bridge <--AtLocation-- Steel <--RelatedTo--> Bar 