To determine impact of visual properties of the designed or the already existing road on the driver’s work environment, and, hence, on the traffic safety, it is necessary to obtain this road’s image, thereto, the sufficiently adequate one to the real observation conditions. The absolutely real image can be obtained only, when observing the already existing road; however, it is important not only to reveal deficiencies, but also not to create them. Therefore, impact of visual properties needs to be evaluated already when designing a road. For this, an algorithm is determined to analyze the road’s visual quality. Its operation is based on regularities established at this thesis. Visual quality of the road alignment is evaluated in conformity with parameters of the image curvature and their evolution nature, when the viewpoint moves along the determined trajectory. In conformity with the algorithm, the computer program is prepared, where the tested road is intended to be evaluated visually, thereto evaluating not the static but the dynamic image. Parallel to the image, graph of the line’s curvature of the tested image is shown, with the possibility to compare the line’s curvature with the value of the perception threshold, in conformity with the criterion established in RPI. Simultaneously, data are prepared to create surface of the line’s curvature function, which allows performing the detailed graphic analysis. The established analysis algorithm is used in solution of the optimization example. In the example, the road alignment is defined as the NURB-spline function. Within the framework of the thesis, to secure the NURB-spline description, the computer program is created. In conformity with the chosen optimization strategy, improvement of visual quality of the road alignment is made, manipulating with the weight wi change of the support course height, closest to the place of the observed defect. In this example, the optimal wi value is determined according to correlation of the regression from the determined resultative features of the freely determined factorial features (wi) with the help of the method of the smallest squares. In the test example, the requirement is determined to obtain the image line in conformity with the satisfactory evaluation, according to the J. Naudžuns criterion. As a result of the example’s optimization, the value wi, appropriate for the visual quality criteria, was determined and the corresponding function of the road alignment description was obtained.