 Peñalosa's six biggest policy actions during his first period as mayor included the relocation of informal vendors who occupied the public zones and streets, the improvement of all the city parks and the construction of several new ones, the construction of major public libraries and large public schools in the poorest areas in the city, the renovation of important avenues such as the 15th Avenue and Autopista Norte, the removal of cars from sidewalks by raising them and installing bollards, and starting construction of the first Mass Transit System in Bogotá, the heavy BRT called TransMilenio, whose construction started under Peñalosa to be finished under Antanas Mockus's second term (2001-2003).Some of his policies were unpopular with certain political groups within the city.Among these were his intent to buy the Country Club of Bogotá to build a public park, which brought him in conflict with some of the wealthiest neighborhoods in Northern Bogotá.