When defining vertical road alignment tangents and vertical curves are employed. Our research goal is to find the balance between the topography and the technical solution. The first part of the present work describes minimal and maximal values of grades and vertical curves with computation of the vertical curvature. The next part describes coordination of vertical and horizontal alignment with the main emphasis on the radius of vertical curvature. In the third part ‘K’ factor denoting horizontal distance needed to produce a 1% change in gradient is defined. Above-mentioned factor depends on some conditions that are fully described in this research project (design speed, stopping side distance, passing side distance, comfort criteria). The relationship between the radius of vertical curvature and the ‘K’ factor is further analysed. The last part includes 3D-animation that was created using ‘CESTA’ computer software. Results clearly show great influence of the ‘K’ factor on the vertical alignment elements. By changing ‘K’ factor values important benefits and weaknesses are obtained showing sag and crest of the vertical curve
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