I don't know how early was early for you, but there was this great article in Runner's World about running in the heat. The guy went running with some Phoenix club and they started their run at 4 am to beat the heat! Dunno about the local cycling clubs though, but I'd hope that hard training rides would also be very, very early!
This being said, I have no idea about the low use of the cycling lanes. I have a couple friends from Phoenix and they both testified of the vitality of the cycling community in Arizona. However they mostly rode way out of town, or so did they tell me...




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