(1) maximum longitudinal slopeThe maximum longitudinal slope is the maximum value of the route which is defined by the factors such as the level of road, the natural condition and the driving demand. It is an important control index for the design of the longitudinal section of the road. The maximum longitudinal slope is 1.528%, and the limit value is 6%.(2) minimum longitudinal slopeIn the area of long cut, low filling and other transverse drainage is not smooth, in order to ensure the drainage requirements, prevent water infiltration and affect the stability of roadbed, road rules of minimum grade should not be less than 0.3%; when the special difficulties of the longitudinal slope is less than 0.3%, should set up a zigzag ditch or take other drainage facilities.(3) slope length restrictionThe slope length is the difference of the pile number of the adjacent slope of the longitudinal section, that is, the horizontal distance. The length of a certain longitudinal slope is called the length limit, including the maximum length limit and the minimum length limit. The design speed of the urban road is 130m, the maximum length of slope is not limited, and the design speed is 60km/h.(4) synthetic slopeRefers to the vector synthesis slope and road longitudinal slope and transverse slope of the "standard" city road engineering design CJJ37-2012 design speed for maximum longitudinal slope of the road for the synthesis of 60km/h 7%, all levels of road minimum synthesis slope should not be less than 0.5%.
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