I use the ninjette to commute during the week. Because lanes are narrow, lanesharing is legal and we've got traffic, I can beat just about anything on the road. I split cars at about 10mph faster than traffic flow where bigger bikes have trouble with rear view mirrors, and I leave all the cars wishing for a ninjette to get them out of the traffic.
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"Improvement makes straight roads, but the crooked roads without improvement, are roads of genius." — William Blake