It's simple to get on the road when relaxed (4-5)

I believe the answer is:

easy-going

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But I can't explain it at all! Could you help me understand?

(Other definitions for easy-going that I've seen before include "Happy-go-lucky" , "Slope" , "Placid and tolerant, not strict" , "Placid; over-tolerant" , "Carefree - relaxed" .)

I've seen this clue in the Sydney Morning Herald.

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