Mexico City´s Government organize the 55 kilometer -Sunday Bike Ride- every week, the principal streets are closed for automobiles and open for bikes, skates, runners and walkers. Every person, kid and even dogs who desire to practice exersice and at the same time make stops without any danger by using the principal avenues of the City, goes to the ride; ther is not restriction of time, gender, or edge. It is a relaxing day.