Tomaţ Tollazzi, Marko Renčelj - Comparative analyse of the two new alternative types of roundabouts – turbo and flower roundabout  (Vol IX, No 3)

Vilnius Gediminas Technical UniversityRiga Technical UniversityTallinn University of TechnologyBaltic Road Association

 

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2015 Impact Factor: 0.519 ©2015 Thomson Reuters, 2015 Journal Citation Report®

ISSN 1822-427X print
ISSN 1822-4288 online
 

 

 
 

"The Baltic Journal of Road and Bridge Engineering"
Vilnius: Technika, 2014, Vol IX, No 3, p. 164-170


Tomaţ Tollazzi, Marko Renčelj

Comparative analyse of the two new alternative types of roundabouts – turbo and flower roundabout

DOI: 10.3846/bjrbe.2014.21 
 
Alternative types of roundabouts are usually more recent and have been implemented only in certain countries. Typically, they differ from “standard” roundabouts in one or more design elements, whilst the purposes of their implementations are also specific. The main reasons for their implementations are particular the disadvantages of “standard” one- or two-lane roundabouts in particular circumstances or changes of “actual circumstances” which in the past has led to roundabout implementations. Today, several different types of roundabouts are well-known (“mini”, “double mini”, “dumb – bell”, “with transition central island”, “with joint splitter islands”, “traffic signal controlled”, “assembled roundabouts” …), and it is possible to stipulate that they will be further developed in the future. This paper illustrates two relative new alternative types of roundabouts – “turbo” and “flower” roundabouts and their comparison from design, traffic safety and capacity point of view.
 
Keywords: roundabouts, two-lane roundabouts, alternative types of roundabouts, turbo roundabout, flower roundabout, comparative analyse.

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