Since last year I have been going on nighttime bike rides. I leave my house at around midnight and come back about 1 to 2 hours later. I do this to avoid the unpleasant obstacles present on the roads during daytime and evening hours. This way I have the road (mostly) all to myself and I can breathe freely without having to worry about inhaling dangerous diesel fumes and other impurities resulting from human activity. I also enjoy the stillness of the air at night and the cool breeze. It's exhilarating. One time I rode for 3 hours straight.

So what do you think of this? Have you ever done it yourself?