| In the construction of expressway m mountain areas, based on the traffic volume survey materials of expressway to be constructed, in construction and in operation, through the analysis of movement equation, stress, dynamic capacity for vehicles, and compared with the requirement for the maximum longitudinal grade and grade line limit in internal and external standards, the paper takes how to adopt the maximum longitudinal grade and grade line limit for the design in Standard as questions, to offer a suggestion value of the maximum longitudinal grade and grade line limit on expressway upward and downward. Considered the suggestion value, the paper analyzes the traffic capacity of highways and the set of climbing lane and makes some concerned suggestions on them. The paper presents the thought of the three classes, which is ideal, general and limit maximum longitudinal grade so that designers can select the maximum longitudinal grade according to various topography and land features conveniently. |
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