Social fragmentation as a consequence of implementing a Bus Rapid Transit system in the city of Bogotá
研究了波哥大快速公交系统（BRT）实施前后不同收入群体的社会碎片化变化，发现支线对边缘区域有积极影响，但主线区域无显著证据。
Urban growth, new economic activities, infrastructure and mobility projects change the way a city and their citizens interact. To assess changes based on the above factors, we use the concept of social fragmentation for two different periods. We propose a methodology that evaluates the degree of social fragmentation in different zones of Bogotá and the impact of the introduction of a Bus Rapid Transit system (BRT). The fragmentation analysis shows an increase in interactions for the three different income groups analysed in the 1995–2005 comparison. The spatial distribution of defragmented zones has also changed. Peripheral zones were isolated in 1995, close to ghettos or closed community concept, while in 2005 their interactions with the city saw an important improvement. The difference in difference analysis shows that feeder lines, serving specially those peripheral zones, have a positive impact on population as the fragmentation indicator decreases. However, no evidence was found regarding trunk line zones.