Always feel free to tweak.
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Just to tweak your noses, I'll point out that by analogy your reasoning would mean the Fire Lane is there for any fire that might need it.
On the contrary, I think the phrase 'fire lane' exactly fits the analogy. My analysis was that the subject of the phrase or clause was an
implied noun identified by the preceding adjective
in context. Just as the adjective 'handicapped' implies the noun 'person' in context -- meaning that the space is only available to handicapped persons -- so does the adjective 'fire' imply the noun 'truck' in context, so that the lane is only for use by fire trucks. Not dump trucks or garbage trucks, just fire trucks.
A picture is worth a thousand words.
I think you'll find that almost every dictionary incorporates as part of its defintion of language, something along the lines of a systematic use of symbols to convey meaning. Therefore, signs do not take language out of the picture; on the contrary, signs are, themselves, part of the picture. Signs are elements of langauge.
Also, please note that the picture is that of a person who happens to be in a wheelchair. It is not the picture of a handicap, it is a picture of a handicapped person. And just as that picture means, in the generic sense "any handicapped person, not just those in wheelchairs", the "fire lane" phrase means any emergency vehicle, not just fire trucks.
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