(1) the maximum longitudinal slopeM

(1) the maximum longitudinal slope
Maximum longitudinal slope based on road grade, natural conditions and traffic requirements, such as entailed by the factor of road longitudinal slope maximum, which is a key control in road vertical section design. This design value of maximum longitudinal slope for 1.528%, limit values for 6%.
(2) the minimum longitudinal slope
Fill in the long cutting and low lateral drainage and other open lots, in order to ensure the drainage requirements to prevent the infiltration of water from affecting the stability of the embankment, specification stipulated minimum longitudinal slope shall not be less than 0.3% when exceptional difficulties longitudinal gradient is less than 0.3% should create zigzag ditches or other drainage facilities.
(3) the slope length limit
Slope is vertical adjacent pile with variable slope point, the difference between the horizontal distance. Some longitudinal length restriction is known as the slope length limit, including the maximum slope length and the minimum length limit. Specification design speed for minimum slope of urban road 60km/h 130m, maximum length is not limited.
(4) synthesis of slope
Synthetic gradient is the vector of road longitudinal slope and cross slope and CJJ37-2012 provisions of the code for design of urban road engineering design speed for 60km/h synthesis of maximum longitudinal slope of 7% at all levels minimum synthetic slope of not less than 0.5% road.