Old, but not really wise
Join Date: Jul 2010
Location: Fairfax, VA commuting to Washington DC
Bikes: 2010 Kona Dew Drop (the daily driver),'07 Specialized Roubaix (the sports car), '99 ish Kona NuNu MTB (the SUV), Schwinn High Plains (circa 1992?) (the beater)
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I can ride a route that is 2 miles longer in about the same time based on the lights, and I'm nowhere near your average pace. You'll almost certainly lose more time at lights than the extra .4 mile at your average speed. Figure an average of 1 min standing still per light or so.