small businesses such as brick making operations, public restrooms and restaurants flagrantly violate sanitation and environmental laws. However, automobiles account for 70% of the air pollution. Stronger environmental regulations have been enacted and enforced, but this has led to the abandonment of the municipality by larger industries who have relocated to the north and west. Over 200 companies have relocated from here and neighboring municipalities Tlalnepantla and Ecatepec. Industries which have left Naucalpan include metals, cement, glass-works and others that use a large quantity of energy. About twenty percent of manufacturing facilities have closed their doors and six industrial parks are empty. In addition to environmental regulation, other actors behind this rising land and rental prices, economic slowdown and competition from Asia. Several major roadways pass through the city and municipality, which connect the Mexico City area to parts north and west, as well as other parts of the metropolitan area. The northern section of the Anillo Periférico passes through Ciudad Satélite. There have been plans to add a second level to this roadway, but local residents have been working against it. One of the concerns is that the new roadway will damage the nearby Torres de Satélite. The recently built Viaducto Bicentenario highway, linking Mexico City with western Mexico State passes through Naucalpan and was the first section to begin operations. This section connects the Lomas Verdes section with Cuatro Caminos at the border of Mexico City. The construction of these roadways is projected to make changes in the urban landscape of the city, attracting projects such as office buildings and commercial centers. A number of projects are already in the works. The goal is to build areas here similar to Santa Fe and Interlomas. Naucalpan is strongly dependent on cars and other motorized transportation. Efforts have been made to promote bicycle use such as bike paths and free bicycle loans, but they have not been successful. One of the best-known areas of Naucalpan is Ciudad Satélite with its signature Torres de Satélite sculpture. Ciudad Satélite was one of a number of large scale projects undertaken by the federal government in the Mexico City area in the 1950s and 1960s, along with the Conjunto Habitacional de Tlaltelolco and the Ciudad Universitaria. From the late 1940s to early 1950s, Mexico City began to grow towards the northern limits of the Federal District, and compelling urbanization into adjoining Mexico State. One