DEVELOPMENT OF THE PROGRAMME SYSTEM FOR THE PERSPECTIVE FILM. PART: AT-GRADE JUNCTIONS

The reported project had the objective of providing the possibility of examining the optical quality of a junction design from the point of view of the driver of a passenger car. The program is based on a modular system and can thus be easiliy extended and modified, and it has been written in the programming language PASCAL. This program permits to make individual pictures and films both of roads in the open country and of junctions areas according to the laws of perspective projection. A variety of driving-specific quantities, such as the eye-level above the carriageway, the line of movement, the velocity profile and the visibility distance, as well as route-specific parameters, such as variable widths of carriageways, heights of slopes, road signs and signals, delineators, guardrails, trees and bushes, are variable elements. All externally calculated or digitized lines are plotted in the junction area. It is thus possible to illustrate junctions simply and quickly, as is the inclusion of complex forms and markings in the perspective picture, after appropriate data preparation. When conceiving the program much importance was attached to its possible later use within the scope of the interactive road design. Considerable progress towards this objective has been achieved by a quick program logic which realizes, depending on the density of data, a photo setup in two to ten seconds.