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title = {{The effects on safety time consumption and environment of large scale use of roundabouts in an urban area: a case study}},  journal = {Accident Analysis \& Prevention},  }  @inproceedings{Bergh_1997,  author = {Bergh, Torsten},  title = {{Roundabouts-Current Swedish Practice and Research}},  booktitle = {Third International Symposium on Intersections Without Traffic Signals},  publisher = {Transportation Research Board},  pages = {36-44},  year = {1997},  }