Here are a few pictures I made near Campinas in Brazil (Sao Paulo state). Rushing at (an allowed) 100KM/h ,you can see this. It's not for me.
Though a real good thing in Campinas is that they close a (two lane) road around a big lake every weekend! So you can run, bike, skate, walk or whatever else as much as you like without every thinking about traffic. It's about a 5~6 km circle. Fantastic! Afterwards you can buy a healthy fruit drink or other food at one of the many outdoor shops. How about we have THAT in Taipei city?