Site of traffic island for pedestrian

I believe the answer is:

middle-of-the-road

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'pedestrian' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for middle-of-the-road that I've seen before include "Unexciting" , "Average" , "Safe" , "Avoiding extremes; moderate" , "place for dangerous drivers?" .)

I've seen this clue in The Telegraph.

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