i hear you all. it is more an attitude i sense and dislike, than an impediment. i too will use the commute to interval train (for kg loss) but will not do so on cyclepaths that are full of traffic. there are a lot of close calls and it seems to be trains of riders led with a few roadies and a few guys on hybrids with backpacks hanging off one side of their back just killing themselves to keep up with the 'peloton'. a lone version of the latter was the type that nearly swiped us today. but still it is not dangerous just generally obnoxious. i hear lovely tales of happy commutes here, but the testosterone level is of the charts where i live. it is not roadies with great skills and courtesy being overly cavalier, it is another type entirely with something to prove. i know the problem is mine though and that a graceful 'what me worry' is the antidote. but in general all i am saying is the same attitude that you see on the road appears to be replicated on the bike paths and i don't so much care for it.