3. Present the specification urban road network-Speed calculation:• Rate is used to calculate the principal elements of the road in terms of limitations. -Maximum slope• The maximum longitudinal slope be reviewed based on design speed, type of road, traffic and line components. -Minimum vision• The vision is one of the important factors to drivers with safe operating speeds of the design has been determined. -The radius of the loop:When running in the curve of the car suffered various adverse conditions such as centrifugal force, vulnerable to obstruct vision. The radius of the curve is a technical factor is studied to the car can run safely with the desired speed, improve the working conditions of the driver and the passenger's travel conditions. -Minimum vertical curve• To link the vertical slope on the vertical geodetic, vertical curve used to run cars, convenient, secure day and night vision, ensure limited the shock force, centrifugal force vertically. -Road vehicles• The car run is the side of the road for vehicles including the lanes and auxiliary lanes (if available). The lanes can be arranged on a strip or segregate on the strips vary depending on the traffic organization of General or private use. Width of car parts have a direct influence on the quality of the car, the car's running speed, capacity and safety. -Summer:• Summer Street is the Division from the outer edge seams to bundle just about red line. Summer sugar can have many functions such as: walking, layout, layout, signage ...
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