Several years after implementation of vertical traffic calming measures on roads, crossing cities and settlements, for the first time in Lithuania the research was carried out to determine their effect on the change in the number of accidents, their severity and noise within the operation zone of speed humps, raised pedestrian crossings and speed bumps. The paper present research methodology and analysis of results of vertical traffic calming influence to the road safety and environment in Lithuania roads. It presents that engineering measures have a positive impact on the improvement of the road index to safety. The study of vertical traffic calming measures impact to environment showed that it does not increase equivalent noise level of vehicle in its installation places.
Directive 2008/96/EC on road infrastructure safety management requires the establishment and implementation of procedures relating to road safety impact assessments (RSIA), road safety audits (RSA), ranking of high accident concentration sections and network safety ranking (NSR) and road safety inspections (RSI). The aim of this article is to present the outputs of BALTRIS project. The goal of the international project BALTRIS is to elaborate the road and street infrastructure safety management procedures and teaching material consistently explaining the above mentioned infrastructure management procedures. Four Baltic Sea region countries (Sweden, Estonia, Latvia, and Lithuania), represented by universities and national road administrations participate in the elaboration of these procedures and teaching material. This article describes the scope of NSR, RSA and RSI procedures prepared in the frame of BALTRIS project, also article provides detailed implementation and execution of procedures for the EU Member States. NSR means a method for identifying, analysing and classifying parts of the existing road network according to their potential for safety development and accident cost savings. Ranking of high accident concentration sectionsmeans a method to identify, analyse and rank sections of the road network which have been in operation for 3÷5 years and upon which a large number of fatal/injury accidents in proportion to the traffic flow or compared to respective conditions have occurred. RSI is a strategic comparative analysis of the impact of the new road or a substantial modification to the existing network on the safety performance of the road network. RSA is a formal safety performance examination of the existing or future road or intersection by an independent audit team.
Excess speed is one of the largest road safety problems causing the increased risk of road crashes. A wide range of safety improvement measures, both educational and engineering, are being implemented to solve this problem. The main objective of those measures is to force vehicle drivers to observe the speed limit requirements and to ensure enforcement of speed requirements. This paper gives an overview of the impact of vehicle speeds on road safety and the effect of safety improvement measures. Possibilities for the implementation of sectorial vehicle speed enforcement system on the roads of national significance of Lithuania are presented. The paper contains criteria for the selection of road sections of Lithuania where the sectorial vehicle speed enforcement system could be installed. The amount of investments is also given necessary for the installation of sectorial vehicle speed enforcement system on the selected road sections as well as their one-year maintenance. Taking into consideration the damage incurred by the country due the people killed on roads a pay-back period of the sectorial vehicle speed enforcement system is determined.
In the world of growing economy and population, the need of transportation is rapidly increasing also raising problems of noise pollution. Environmental noise levels are increasing in parallel with increasing traffic flows resulting negative effects for society, wildlife and economy. The article gives an overview about the main transport noise source tyre/road noise, its generation mechanisms and influencing factors. One of the most effective and promising tyre/road noise solutions is low noise pavements, which has different noise reduction approaches. Low noise asphalt pavements and theoretical noise reduction principles are analysed in the paper as well as the development experience of particular low noise asphalt pavements for Lithuanian conditions.
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