 Roads in areas with urban consolidation policies are often overburdened with increased intercity traffic in addition to the preexisting suburban commuter traffic, and this problem is not always easily solved with transit-oriented development.Drainage systems are severely impacted by higher populations, potentially leading to increased flooding and pollutant runoff.Open spaces in high-density urban areas often conflict with urban consolidation policies; residents of high-density areas require a significantly higher amount of open space, but this would limit development of consolidation-oriented housing and transportation.