The dispute of Dong-style urban Festival mode

Deng Li How do cities make life better?　　In the 1961, Jane Jacobs wrote "The Death and Health of America's big cities", which has become a classic in architectural and planning circles, and is known as a mirror of urban planning. Jacobs declaration: The city's dynamism comes from diversity.　　For big city diseases-traffic jams, the prescriptions are: instead of fixing more roads, they should be solved by reducing the chance of car use, and by providing a variety of travel options to slowly reduce people's reliance on cars in cities. Dong Guoliang challenged Jacobs's theory that the world had entered the era of popular cars. Dong said, "The urban festival pattern is the third generation city's optimal model". Dong was chairman of the Board of Supervisors of Shenzhen Stock Exchange.　　The invention is being rolled out in the National Pavilion with the title "JD Mode-a Low-carbon city with smooth traffic".　　At the same time, Shanghai Tongji University is a professor of independent research "Urban Festival mode." Dong version of "Urban Festival mode" Dong Guoliang said that the urban festival model if all adopted in China's urbanization, can save about 60 trillion of urban construction investment-urban infrastructure construction and urban area is directly proportional to. The average city's infrastructure investment is about 4.6 billion per square kilometer, not the subway. For example, Shanghai more than 20 million people, urban area of 3000 square kilometers, if the use of Festival mode, 20 million people have 400 square kilometers is enough.　　Shanghai construction jiading New Town can be used for reference. Dong Guoliang calculation, Beijing, Shanghai, Guangzhou, the use of traffic resources only 20%, if the use of the section-land model, the speed of motor vehicle traffic is now 5 times times.　　According to the Dong version of the "City Festival mode", the main steps are: The first step: no people and bicycles on the ground road, the entire ground road to the use of cars, improve the capacity to solve traffic congestion.　　The second step, the two sides of the ground road for parking, building a floor as a parking garage, parking space is now more than 10 times times, about a square kilometer of 20,000 parking spaces, than digging underground garage costs much lower.　　The third step, the roof of the ground parking garage, the house and the house are connected with the corridor, forming an accessible space and road network, commercial and greening on the ground platform roof.　　The fourth step, 40% of the ground near the road to build green space.　　The land and Resources newspaper reported that the transformation of the New River delta in Changsha, Hunan, for reference to the "Urban Festival model", the use of three-dimensional urban grounding development model. The design scheme is divided into three levels.　　At an altitude of 32 meters elevation platform to form a rapid and convenient vehicle traffic system, at 38 m elevation below the overhead layer to form 30,000 parking spaces static traffic system; Elevation 38 meters is the space of pedestrian activity.　　"It can be discussed, not exaggerated" although Dong Guoliang thinks his invention is a major achievement, the academics have reservations about it. Dajian, director of the Institute of Sustainable Development and management, Tongji University, said that Dong Guoliang's Urban festival model has novel places, such as for traffic problems, before we are all plane thinking, into the vertical has a certain degree of rationality,The use of urban space is increased; the other is a compact concept, and according to him, all functions can be achieved on a two-storey overhead. "But I don't think that this pattern is omnipotent, the most crucial question is, such a pattern, small scope problem is not too big, but if Beijing and Shanghai have to stand up, think it is very scary, we have been very depressed on the elevated road, in 2005, I was in Boston, Boston, have taken off the elevated road, It's all under the ground.　　"Another problem is that the road to the ground is left to the car, in the end is people-oriented, or car-centered?"　　The third issue, the prerequisite is the era of automobile popularization, but the international third generation of urban concept, more is the urban rail transit, if all advocate the use of cars, energy use and emissions will increase.　　Professor Xiaoguang, director of the Department of Transportation Engineering, Tongji University, Shanghai has indeed asked Tongji to organize several professors to discriminate the pattern, before independent research results, they will not make a judgment evaluation. He stressed that the Dong Guoliang model is very important to study, but not necessarily the model.　　The whole big aspect has the reference place, but certainly does not exaggerate. Jacobs's writing "Death and life in big American cities" is closely linked to previous urban construction in the United States. Urban suburbanization, Architectural modernism, and focus on the construction of urban landmarks.　　New York began to "share the pie" quickly, and had to start building a network of high-speed roads. The complexity of the city's original life has been replaced by traffic complexity, and the phenomenon mentioned in Jacobs book is spreading in most Chinese cities. Can Dong-style prescriptions solve these urban diseases?