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http://www.newsshopper.co.uk/news/9887612.Lewisham_bus_driver_delivers_baby_during_rush_hour_on_1... /
A LEWISHAM bus driver has spoken of the journey he will “never forget” when he helped deliver a baby during rush hour.

http://swns.com/police-hunt-road-rage-businessman-who-tried-to-stab-teenager-with-a-screwdriver-080843.html
Terrified James Peacock, 18, was pursued for 10 minutes during busy rush hour by a man driving a silver Mercedes.

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"Rush hour" means "a time during the day early in the morning or late in the afternoon when many people are traveling on roads to get to work or to get home from work (http://www.learnersdictionary.com/search/rush )." What does "busy rush hour" mean?
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Hi,

The word 'busy' seems a bit unnecessary. The writer just wants to add some emphasis to the phrase.

Clive
Comments  
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Thank you, Clive. Emotion: wink
I expect the writer used busy either for emphasis or to specify that the event took place at the busiest point in rush hour, since the beginning or latter point isn't quite as busy. I vote for emphasis.