Last summer I rode 14 miles round-trip on my commute. Your trial run is certainly more difficult than your actual commute will be since you only do half of it at a time, and will quickly improve your physical fitness.
This year my company didn't win the lottery for the Hood to Coast relay, so I had no motivation to be in shape. Also, I'm driving a Prius plug-in, so I'm not using any fuel to begin with. Finally, my work schedule changed to 7pm-7am, which puts me in heavier traffic.
I'd say go for it. Far more people die of health related issues stemming from improper diet and exercise than from traffic fatalities.
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