Road Surface Geometry

Concept

The geometry of a road surface is essential in the definition of the plan boundaries of the bridge and elevations of its deck surface. Road geometry is represented in the system by longitudinal trajectory lines that bounds the surfaces of the road. A trajectory may consist of one or more segment along the length of the road , each is defined by two functions:-

1. The profile of its plan projection defined by station and horizontal offsets from the road's profile control
2. the cross-fall (% slope) from the trajectory to its preceding trajectory

Using the above concept , the user can define simple or very complex geometry of roads with variable width and superelevation. The system also allows the definition of road trajectories that are parallel to ramp alignments thus capturing the geometry of main roads and ramp road in the same model. Ground surface topology is integrated with that of road geometry allowing to obtain ground elevation at any location on the road.

Road Geometry reports

The system allows printing and viewing graphs and tabular data related to the plan and profile of road trajectories. It also produces graphs for one or many road sections at selected stations. The system also produces a tabular report giving, at regular intervals along the road, the distances between trajectories , elevations of trajectories and profile control, superelevation, height and volume of cut and fill. The system provides many options for viewing and printing road reports.