Sirens - I'm on a main street close to a hospital, so I have a noise machine to limit the disturbance to my sleep. Also, for some reason, the street sees more than its share of weird car crashes (car completely tipped over a few weeks ago, car wrapped around a tree last summer, several head on collisions in the autumn and over the winter...), even though there's a 30mph speed limit. Other than that, it's a nice street, lined with mature trees, plenty of room for parking, lovely front yards.