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The road is narrower ahead. The road is narrower ahead. The road is narrower ahead.
narrow is narrower than broad because it is.
taxonomy
narrower.
The new Fords are narrower than the old models.
No.
'Narrower' is in comparative adjective form, e.g. "This hallway is narrower than the others".
The adverb form would be 'narrowly', e.g. "the train narrowly missed the man by the rails".