Numerous circular intersections existed before the advent of roundabouts, including Place de l'Etoile, New York's Columbus Circle, and several circles in Washington, D.C.. However, the operation and entrance features of these circles differed considerably from modern roundabouts. The first roundabout was built in Letchworth in 1909 – originally intended as a traffic island for pedestrians.[3]​[4]​.

However, the widespread use of modern roundabouts with preference rules where incoming vehicles must yield,[5]​ began in the 1960s in the United Kingdom, when engineers such as Frank Blackmore") invented the mini-roundabout to overcome their capacity and safety limitations.[6]​.

Its implementation occurred specifically in November 1966 when Blackmore, at the head of the T.R.R.L (Transport and Road Research Laboratory), dedicated himself to solving one of the main problems that occurred at road crossings: their congestion and collisions due to path cuts. When a vehicle arrived at an intersection, it had to cross multiple paths of other vehicles coming from other directions and converging at the intersection. A driver had to look left, right and forward while crossing it.[7]​.

After years of development and testing, they concluded that the best solution was to incorporate a turn within the intersection, common to all vehicles arriving at it from all directions. Thus, from that moment on, a driver who reached the intersection only had to look in one direction, the one from which the vehicles circulating inside the roundabout ring were now coming. Likewise, this rotating circulation eliminated the aforementioned path cuts and made the crossing now a safer and more efficient point on the road. In most cases, the need for traffic lights at the intersection was eliminated, since it was simply necessary to give way to vehicles traveling in the lanes within the ring and enter it after passing, making vehicle traffic much more fluid.

Even with all this, in countries like Spain there has always been great confusion about its use, with erroneous interpretations and teachings, a mixture of terms and forms of use of types of roads that have nothing to do with an intersection, which has led to years and years in which the volume of accidents at this type of intersections multiplied by ten that of other countries.

In 1998, the so-called turboroundabouts or turboroundabouts emerged in the Netherlands to solve problems of traffic congestion at intersections.[8] These are a type of roundabout that has implemented in itself through road markings the correct way of using a normal roundabout by a driver, that is, the way of use as they were designed. Interior traffic has priority over traffic seeking access and is directed towards different exits in such a way that it is not possible to bypass the entire roundabout in the exterior lane. This means that the use of the ideal lane is necessarily the correct one to access the desired exit. This logic that is implemented in turbo roundabouts basically eliminates two maneuvers: the need to change the outside lane to leave them and the need to make a turn beyond our second exit, reducing the points of conflict. Both maneuvers are actually the culprit of the majority of accidents that occur in classic roundabouts when path cuts are generated in their interior circulation.[9]​.

The roundabout consists of a square, with a circular road around it, where several roads join; Two simple rules apply in it:

1. • The direction of rotation on the ring or circular road in countries where they drive on the right side is to the left or counterclockwise.

2. • Vehicles that are already circulating inside the roundabout have priority (priority to the left if the rule requires circulation on the right and vice versa), unlike at normal intersections.

The roundabout requires controlling the speed of the vehicles that cross it, since its radius forces them not to exceed a certain speed (so as not to overturn), and in low or medium traffic it reduces the delays in crossing it by avoiding stops at traffic lights.

On roads with two or more lanes, the system presents complications due to the crossing of vehicles when entering or leaving the roundabout due to the lack of skill of some drivers, especially when the driver does not use the turn signals. To avoid these problems and increase the capacity of the roundabout, the turbo-roundabout has been developed in the Netherlands.

On roads with dense traffic or many concatenated roundabouts, it causes driving fatigue, since entering and leaving the roundabout, together with changing and monitoring the speed, places additional stress on the driver.

The capacity of the roundabout is limited by the minimum interval between vehicles within the roundabout that each driver judges sufficient to enter it. This interval is highly variable depending on people and countries. One of the best-known capacity models is the one developed by the Transportation Research Board") (TRB) and the Federal Highway Administration") (FHWA) for roundabouts in the United States, published in the Highway Capacity Manual") (HCM)[11]​ and the TRB-FHWA Roundabout Informational Guide (NCHRP")[12]​ The HCM Edition 6 model is based on interval acceptance theory (gap-acceptance).

Cephalian Union Signaling Code").

Several roundabouts around the world also function as supports for artistic expressions, such as installations and sculptures. Some examples are:

• - Bend "Bend (Oregon)"), Oregon (United States); The sculptures on the roundabouts in Bend were honored by "Americans for the Arts" as one of the 37 most innovative approaches to Public Art in the North American country.[13]​ Following the tour map you can look for 20 sculptures that sit on the roundabouts around Bend.[14]​.

• - Fuerteventura, Canary Islands (Spain); The local government and municipalities have exhibited sculptures at the most important roundabouts.[15]​.

• - Guadalajara "Guadalajara (Mexico)"), Jalisco, Mexico; The Glorieta Minerva is one of the most representative monuments of the city, and consists of a roundabout located at the intersection of López Mateos, Agustín Yáñez, Vallarta, López Cotilla and Golfo de Cortés avenues, with a large statue of the goddess Minerva on a pedestal flanked by 2 walls, all located in the center of a large circular fountain.

• - Many countries in Europe (first France,[16]​ but also Germany,[17]​ Austria,[17]​ Italy,[18]​ Spain,[19]​ and others[17]​) demonstrate the widespread use of roundabouts as places to install contemporary art.[20]​.

• - An inventory of roundabouts in France, made by Marc Lescuyer, listed 3,328 roundabouts with artistic decoration, as of early 2010.[20][21]​.

• - Road intersection.

• - Pedestrian crossing.

• - Zebra crossing.

• - “Give way” sign.

• - "Stop" sign.

• - Examples of Spanish roundabouts.

Numerous circular intersections existed before the advent of roundabouts, including Place de l'Etoile, New York's Columbus Circle, and several circles in Washington, D.C.. However, the operation and entrance features of these circles differed considerably from modern roundabouts. The first roundabout was built in Letchworth in 1909 – originally intended as a traffic island for pedestrians.[3]​[4]​.

However, the widespread use of modern roundabouts with preference rules where incoming vehicles must yield,[5]​ began in the 1960s in the United Kingdom, when engineers such as Frank Blackmore") invented the mini-roundabout to overcome their capacity and safety limitations.[6]​.

Its implementation occurred specifically in November 1966 when Blackmore, at the head of the T.R.R.L (Transport and Road Research Laboratory), dedicated himself to solving one of the main problems that occurred at road crossings: their congestion and collisions due to path cuts. When a vehicle arrived at an intersection, it had to cross multiple paths of other vehicles coming from other directions and converging at the intersection. A driver had to look left, right and forward while crossing it.[7]​.

After years of development and testing, they concluded that the best solution was to incorporate a turn within the intersection, common to all vehicles arriving at it from all directions. Thus, from that moment on, a driver who reached the intersection only had to look in one direction, the one from which the vehicles circulating inside the roundabout ring were now coming. Likewise, this rotating circulation eliminated the aforementioned path cuts and made the crossing now a safer and more efficient point on the road. In most cases, the need for traffic lights at the intersection was eliminated, since it was simply necessary to give way to vehicles traveling in the lanes within the ring and enter it after passing, making vehicle traffic much more fluid.

Even with all this, in countries like Spain there has always been great confusion about its use, with erroneous interpretations and teachings, a mixture of terms and forms of use of types of roads that have nothing to do with an intersection, which has led to years and years in which the volume of accidents at this type of intersections multiplied by ten that of other countries.

In 1998, the so-called turboroundabouts or turboroundabouts emerged in the Netherlands to solve problems of traffic congestion at intersections.[8] These are a type of roundabout that has implemented in itself through road markings the correct way of using a normal roundabout by a driver, that is, the way of use as they were designed. Interior traffic has priority over traffic seeking access and is directed towards different exits in such a way that it is not possible to bypass the entire roundabout in the exterior lane. This means that the use of the ideal lane is necessarily the correct one to access the desired exit. This logic that is implemented in turbo roundabouts basically eliminates two maneuvers: the need to change the outside lane to leave them and the need to make a turn beyond our second exit, reducing the points of conflict. Both maneuvers are actually the culprit of the majority of accidents that occur in classic roundabouts when path cuts are generated in their interior circulation.[9]​.

The roundabout consists of a square, with a circular road around it, where several roads join; Two simple rules apply in it:

1. • The direction of rotation on the ring or circular road in countries where they drive on the right side is to the left or counterclockwise.

2. • Vehicles that are already circulating inside the roundabout have priority (priority to the left if the rule requires circulation on the right and vice versa), unlike at normal intersections.

The roundabout requires controlling the speed of the vehicles that cross it, since its radius forces them not to exceed a certain speed (so as not to overturn), and in low or medium traffic it reduces the delays in crossing it by avoiding stops at traffic lights.

On roads with two or more lanes, the system presents complications due to the crossing of vehicles when entering or leaving the roundabout due to the lack of skill of some drivers, especially when the driver does not use the turn signals. To avoid these problems and increase the capacity of the roundabout, the turbo-roundabout has been developed in the Netherlands.

On roads with dense traffic or many concatenated roundabouts, it causes driving fatigue, since entering and leaving the roundabout, together with changing and monitoring the speed, places additional stress on the driver.

The capacity of the roundabout is limited by the minimum interval between vehicles within the roundabout that each driver judges sufficient to enter it. This interval is highly variable depending on people and countries. One of the best-known capacity models is the one developed by the Transportation Research Board") (TRB) and the Federal Highway Administration") (FHWA) for roundabouts in the United States, published in the Highway Capacity Manual") (HCM)[11]​ and the TRB-FHWA Roundabout Informational Guide (NCHRP")[12]​ The HCM Edition 6 model is based on interval acceptance theory (gap-acceptance).

Cephalian Union Signaling Code").

Several roundabouts around the world also function as supports for artistic expressions, such as installations and sculptures. Some examples are:

• - Bend "Bend (Oregon)"), Oregon (United States); The sculptures on the roundabouts in Bend were honored by "Americans for the Arts" as one of the 37 most innovative approaches to Public Art in the North American country.[13]​ Following the tour map you can look for 20 sculptures that sit on the roundabouts around Bend.[14]​.

• - Fuerteventura, Canary Islands (Spain); The local government and municipalities have exhibited sculptures at the most important roundabouts.[15]​.

• - Guadalajara "Guadalajara (Mexico)"), Jalisco, Mexico; The Glorieta Minerva is one of the most representative monuments of the city, and consists of a roundabout located at the intersection of López Mateos, Agustín Yáñez, Vallarta, López Cotilla and Golfo de Cortés avenues, with a large statue of the goddess Minerva on a pedestal flanked by 2 walls, all located in the center of a large circular fountain.

• - Many countries in Europe (first France,[16]​ but also Germany,[17]​ Austria,[17]​ Italy,[18]​ Spain,[19]​ and others[17]​) demonstrate the widespread use of roundabouts as places to install contemporary art.[20]​.

• - An inventory of roundabouts in France, made by Marc Lescuyer, listed 3,328 roundabouts with artistic decoration, as of early 2010.[20][21]​.

• - Road intersection.

• - Pedestrian crossing.

• - Zebra crossing.

• - “Give way” sign.

• - "Stop" sign.

• - Examples of Spanish roundabouts.