History
The initial guiding principles of CSS came out of the 1998 "Thinking Beyond the Pavement" conference as a means to describe and foster transportation projects that preserve and enhance the natural and built environments along with economic and social assets for neighborhoods they pass through. In 2003, the Federal Highway Administration announced that under one of its three Vital Few Objectives (Environmental Stewardship and Streamlining) they had a target goal of achieving CSS integration within all state Departments of Transportation by September 2007.
The American Association of State Highway and Transportation Organizations (AASHTO) is now (fall 2006) developing strategic goals and objectives for CSS which it describes as a "fundamental change in the way we do business." One principal element of this change is the way transportation planners and engineers address speed. Historically, the speed at which a vehicle can safely travel through the landscape has been regarded as a primary goal of transportation planning since it shortens travel time, saves money (time is money), and improves driver convenience. However, CSS recognizes that designing a facility for the maximum safe speed that is economically feasible can be detrimental to other community goals, and even to vehicle passengers themselves. CSS recognizes that the goal of transportation is social and economic exchange, which cannot occur at high speeds. Instead, CSS attempts to identify, through a community-based process, a "target speed that promotes the optimum amount of social and economic exchange, with lowest environmental impacts, that is appropriate for the context. Thus, in cities, if higher vehicle speeds lower the amount of social exchange on a residential street (fewer friends, less street life etc.) then the street will be designed to encourage drivers to slow down so as not to reduce social exchange. In a similar manner, commercial streets will be designed to maximize commercial exchange and designed accordingly. In more rural areas where a primary goal is to move people and goods between human settlements, CSS can be compatibile with much higher design speeds. Setting a target speed that is appropriate for the context, and then designing roads, highway and streets to make it difficult for drivers to exceed that target speed, is a central CSS principle and represents a fundamental shift in transportation planning practice.
Read more about this topic: Context-sensitive Solutions (transport)
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