Abstract
This summary of the author’s PhD thesis supervised by Assoc Prof Dr Daiva Žilionienė and defended on 21 January 2011 at the Vilnius Gediminas Technical University. The thesis is written in Lithuanian and is available from the author upon request. Chapter 1 gives the analysis of road classifications in Europe and other countries of the world, the development of road classification in Lithuania, also the sustainable safety principles and driving conditions on lowvolume roads the aim and tasks of the work are formulated. Chapter 2 presents analysis of road alignment elements and road structure elements, also their influence on driving conditions and visibility. Chapter 3 describes methodology of experimental research aimed to determine, analyze and model the quality of the existing low-volume road alignment, parameters of road structures and characteristics of road pavements. Chapter 4 gives data obtained by the experimental research, data analysis, evaluation and the models for the improvement of driving conditions in designing and reconstructing low-volume roads.
Highlights
This summary of the author’s PhD thesis supervised by Assoc Prof Dr Daiva Žilionienė and defended on 21 January 2011 at the Vilnius Gediminas Technical University
The work studies an important problem of the civil engineering science – factors, their influence on identifying which roads will be attributed to the group of lowvolume roads, and the parameters of low-volume roads having the effect on traffic safety
Monograms for the determination of visibility on vertical curves are presented; 3) mathematical models are given for the selection of reagents to reduce dustiness on low-volume gravel roads and to improve driving conditions; 4) traffic safety assurance measures are suggested to be used on roads with a minimum width of traffic lane by erecting shoulders of the sufficient strength; 5) model for the design of low-volume roads is presented aimed to guarantee the proper driving conditions; 6) model for the use of low-volume roads is presented aimed to guarantee the proper driving conditions
Summary
Lithuania’s road network of national significance is sufficiently well developed (> 21 000 km) and over the past 10 years has been changing insignificantly. Aim and tasks of the work – having studied the geometric parameters and structures of low-volume roads to propose models for improvement of driving conditions and to suggest practical actions based on the sustainable safety principles. The following tasks were solved to achieve the aim of this work: 1) determination of tendencies and perspectives for the improvement of driving conditions (traffic quality) on low-volume roads (reconstruction of low-volume roads, paving of gravel roads, the use of dust-reducing measures); 2) investigation of the correspondence of low-volume roads to traffic safety and driving conditions in the aspect of the improvement of driving conditions; 3) investigation of measures to improve visibility and driving conditions; 4) experimental research of the influence of the main elements of low-volume roads (horizontal alignment, vertical alignment, cross section, visibility) on safe driving speed, data analysis and evaluation; 5) experimental research of the reduction of dustiness on low-volume gravel roads in order to improve visibility and driving conditions, data analysis and evaluation; 6) experimental research of the strength of shoulders on low-volume asphalt roads, data analysis and evaluation; 7) models for the improvement of driving conditions on low-volume roads based on the generalization of the results obtained
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