i commute with literally hundreds of other bikers, enough to cause traffic jams even on the widest of bike lanes sometimes. i try to resist the urge to race but every so often so a guy with a nicer bike will come along desperate to leave me behind so i just keep right along side them matching their speed until they give up. it really is a lot of fun.
i will however race the electric bikes because they think they own the road. i love to do it tour de france style, get on their back wheel out of the wind and then fly past them when the road is clear.