In retrospect, poorly balanced transportation systems in the United States have led to auto-dependent communities. Over the past several decades our communities have become less walkable, less bikeable and less accessible to public transit. As consequences, rates of obesity have increased and our communities become unhealthy. Recently there have been ample efforts to reverse the trend by building better walkable and bikeable transportation environment. However, there are still concerns on safety. This special session intends to discuss safety concerns in developing livable communities, especially for pedestrian, bicyclists, senior population, and people with disabilities.