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Ahac, S. Geometric Design of Suburban Roundabouts. Encyclopedia. Available online: https://encyclopedia.pub/entry/12800 (accessed on 04 August 2024).
Ahac S. Geometric Design of Suburban Roundabouts. Encyclopedia. Available at: https://encyclopedia.pub/entry/12800. Accessed August 04, 2024.
Ahac, Saša. "Geometric Design of Suburban Roundabouts" Encyclopedia, https://encyclopedia.pub/entry/12800 (accessed August 04, 2024).
Ahac, S. (2021, August 05). Geometric Design of Suburban Roundabouts. In Encyclopedia. https://encyclopedia.pub/entry/12800
Ahac, Saša. "Geometric Design of Suburban Roundabouts." Encyclopedia. Web. 05 August, 2021.
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A modern roundabout is an intersection with a circulatory roadway at which the vehicle speed is low, and the traffic is continuous and circulating in one direction around the central island towards the exits at the approach legs. Modern roundabout design is an iterative process that is composed of the following steps: (1) the identification of the roundabout as the optimal traffic solution; (2) the definition of the number of lanes at the intersection based on the required capacity and the level of service; (3) the initial design of the roundabout geometry; (4) design vehicle swept path, the fastest path analysis, and visibility performance checks; and (5) detailed roundabout design if the results of the performance checks are in line with the design recommendations. Initial roundabout geometry design elements are not independent of each other; therefore, care must be taken to provide compatibility between them. An overview and a comparative analysis of the initial geometric design elements for suburban single-lane roundabouts defined in roundabout design guidelines and norms used in Croatia, Austria, France, the Netherlands, Germany, Serbia, and Switzerland is given in this entry.

The development of modern roundabouts began in the 1960s in the United Kingdom with the adoption of the yield-at-entry rule, which gave the circulating traffic priority over entering traffic [1]. Modern roundabouts spread to other parts of Europe in the 1980s [2]. Intensive construction of roundabouts has begun in Europe in the last 30 years. European countries that stand out in the total number of roundabouts are France (63,212), Spain (36,762), and Italy (30,917) [3], and states like the Netherlands, Sweden, Switzerland, Denmark, Finland, Germany, and Austria are also pursuing policies of mass roundabout construction.
Modern roundabout design is an iterative process, and it begins with the identification of the roundabout as the optimal traffic solution in the given conditions. The initial roundabout design refers to (1) defining the size of the intersection by selecting the outer radius, (2) laying the approach leg axes, and (3) defining the geometry of the design elements on roundabout entry and exit lanes, circulatory roadway, and central island. The initial design of the roundabout is usually followed by three performance checks: the examination of the design vehicle swept path, the fastest path analysis, and the visibility checks. If the results of these checks are not in line with the design recommendations, the geometry of the elements applied in the initial design phase is modified.

### References

1. Waddell, E. Evolution of Roundabout Technology—A History-Based Literature Review. In Proceedings of the Institute of Transportation Engineers 67th annual Meeting, Boston, MA, USA, 3–7 August 1997.
2. Brilon, W. Studies on Roundabouts in Germany: Lessons Learned. In Proceedings of the 3rd International Roundabout Conference, Carmel, IN, USA, 17–20 May 2011.
3. Beyondthemaps. Available online: https://beyondthemaps.wordpress.com/2017/08/26/roundabouts-in-europe-2017-edition/ (accessed on 16 June 2021).
4. Smjernice za Projektiranje Kružnih Raskrižja na Državnim Cestama, Hrvatske Ceste. 2014. Available online: https://hrvatske-ceste.hr/hr/stranice/tehnicka-dokumentacija/dokumenti/45-smjernice-za-projektiranje-kruznih-raskrizja (accessed on 16 June 2021).
5. Plangleiche Knoten–Kreisverkehre; (RVS 03.05.14); Österreichische Forschungsgesellschaft Straße-Schiene-Verkehr (FSV): Wien, Austria, 2010.
6. Aménagement des Carrefours Interurbains sur les Routes Principales, Carrefours Plans—Guide Technique; Service d’Etudes Techniques des Routes et Autoroutes, Centre de la Sécurité et des Techniques Routières: Bagneux, France, 1998.
7. CROW: Eenheid in Rotondes; CROW publication no.126; CROW: Ede, The Netherlands, 1998.
8. Roundabouts—Application and Design: A Practical Manual; (Dutch) Ministry of Transport, Public Works and Water Management, Partners for Roads: Amsterdam, The Netherlands, 2009.
9. Merkblatt für die Anlage von Kreisverkehren, K 10000; FGSV (Forschungsgesellschaft für Strassen-und Verkehrswesen): Köln, Germany, 2006.
10. Pravilnik o Uslovima Koje sa Aspekta Bezbednosti Saobraćaja Moraju da Ispunjavaju Putni Objekti i Drugi Elementi Javnog Puta, Službeni Glasnik RS, br. 50/2011. Available online: https://www.mgsi.gov.rs/sites/default/files/Pravilnik%20o%20uslovima%20koje%20sa%20aspekta%20bezbednosti%20saobracaja%20moraju%20da%20ispunjavaju%20putni%20objekti%20i%20drugi%20elementi%20javnog%20puta.pdf (accessed on 16 June 2021).
11. Maletin, M.; Andjus, V.; Katanić, J. Tehnička Uputstva za Projektovanje Površinskih Raskrsnica (PGS-PR/07); Građevinski Centar: Beograd, Serbia, 2010.
12. Knoten, Knoten mit Kreisverkehr; Schweizer Norm (SN 640 263); Vereinigung Schwiezerischer Strassenfachleute (VSS): Zürich, Switzerland, 2000.
13. Kontrolle der Befahrbarkeit; Schweizer Norm (SN 640 271a); Vereinigung Schwiezerischer Strassenfachleute (VSS): Zürich, Switzerland, 1991.
14. Knoten, Knoten in Einer Ebene (ohne Kreisverkehr); Schweizer Norm (SN 640 262); Vereinigung Schwiezerischer Strassenfachleute (VSS): Zürich, Switzerland, 1999.
15. Bovy, P.; de Aragao, P.; Blanc, P.H.; Veuve, L. Guide Suisse des Giratoires; Fonds de Securite Routiere, Institut des Transports et de Planification, Ecole Polytechnique Federale de Lausanne: Lausanne, Switzerland, 1991.
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