Abstract
It was in the year 2001 when Lithuania first started constructing roundabouts on the rural roads of national significance with the heavyweight transit traffic and creating conditions for sustainably safe traffic. A data of statistical analysis shows that Lithuania aims at designing and constructing small roundabouts where the diameter of central island in most cases is higher than the average diameter of 25 m. Design and construction of roundabouts on Lithuanian roads often face the problem of territories. For this reason, the inner and outer radii as well as the entry and exit radii of roundabouts are minimum and do not meet the current requirements. Having studied, analyzed and assessed detail designs of roundabouts it could be stated that the structural defects could be caused not only by the deficiencies of some design standards or recommendations but also by the inaccurate use of current standards what results in taking improper design solutions and technological violations during construction of roundabouts and author and technical supervision create favourable conditions for the initiation of defects.
Highlights
IntroductionAs mentioned by Antov et al (2009), Čygas et al(2009), Ēalışkanelli et al (2009), Skrodenis et al (2009) and in Roundabouts: an Informational Guide, roundabouts may improve intersection safety by:
As mentioned by Antov et al (2009), Čygas et al(2009), Ēalışkanelli et al (2009), Skrodenis et al (2009) and in Roundabouts: an Informational Guide, roundabouts may improve intersection safety by:−−eliminating or altering conflicts; −−decreasing speeds into and through the intersection; −−decreasing speed differentials. Daniels et al (2008; 2009), Elvik (2003) and Persaud et al (2001) states that roundabouts are able to reduce injury crashes considerably, not for all user groups
Design and construction of roundabouts on Lithuanian roads often face the problem of territories
Summary
As mentioned by Antov et al (2009), Čygas et al(2009), Ēalışkanelli et al (2009), Skrodenis et al (2009) and in Roundabouts: an Informational Guide, roundabouts may improve intersection safety by:. −−eliminating or altering conflicts; −−decreasing speeds into and through the intersection; −−decreasing speed differentials. Daniels et al (2008; 2009), Elvik (2003) and Persaud et al (2001) states that roundabouts are able to reduce injury crashes considerably, not for all user groups. The crash severity is strongly dependent of the involved types of road users. Fatalities or serious injuries in multiple-vehicle crashes for drivers of four-wheeled vehicles at roundabouts are relatively rare (Daniels et al 2010a). Vulnerable road users are more frequently than expected involved in crashes at roundabouts and roundabouts with cycle lanes are clearly performing worse than roundabouts with cycle paths. ISSN 1822-427X print / ISSN 1822-4288 online http://www.bjrbe.vgtu.lt sions: inscribed circle diameter, central island diameter, road width or the number of lanes (Daniels et al 2010b)
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