Commuters.
It is such a common thing around here for people to zip around on motorcycles, scooters, bikes... and even the occasional ATV (These four-wheelers are even registered with regular license plates!!!!). The weather is decent enough most of the time to warrant cruising around on two wheels, and even rain doesn't keep the bikes off the road. For a city that is relatively small (about 250,000 people), the streets are usually quiet. However I'm starting to get annoyed by the tiny scooters and small (less than 200cc) motorcycles - They're like annoying little knats or mosquitos - For some reason their exhaust note is much louder than the cars (guess that it's legal), and they sound like bugs as they come whining down the road.. Overall, though, the cars and bikes seem to get along nicely, with mutual respect on both sides. This is much unlike the States, where most car-drivers (cagers) never know to look for people that might be on a vehicle a bit smaller than them (bikes). For everyone who reads this post, make sure you always check EVERY corner of your mirrors and blind-spots for motorcycles - So many bikers die each year because the person in the car simply "didn't see them".