According to simulations, a two-lane roundabout with three exits should offer 12–20% greater traffic flow than a conventional, three-lane roundabout of the same size. The reason is reduced weaving that makes entering and exiting more predictable. Because there are only ten points of conflict (compared with 8 for a conventional single lane roundabout, or between 32 and 64 with traffic signal control), this design is often safer as well. Research and experiments show that traffic accidents are reduced by 72% on turbo roundabouts compared to multi-lane roundabouts, which have 12 points of conflict. Research at Windesheim University also shows that turbo roundabouts reduce accidents including casualties by some 75% when compared to regular intersections, and by 61% compared to single-lane roundabouts. The same research made it very clear that it is safer for cyclists not to have priority over motor vehicles on the roundabout, than to have it. At least 70 have been built in the Netherlands, while many turbos (or similar, lane splitting designs) can be found in southeast Asia. Alt URL The turbo roundabout design is given as an example in the federal Manual on Uniform Traffic Control Devices.
According to simulations, a two-lane roundabout with three exits should offer 12–20% greater traffic flow than a conventional, three-lane roundabout of the same size The reason is reduced weaving that makes entering and exiting more predictable Because there are only ten points of conflict (compared with 8 for a conventional single lane roundabout or between 32 and 64 with traffic signal control), this design is often safer as well. Research and experiments show that traffic accidents are reduced by 72% on turbo roundabouts compared to multi-lane rou.ndabouts, which have 12 points of conflict. Research at Windesheim University also shows that turbo roundabouts reduce accidents including casualties by some 75% when compared to regular intersections, and by 61% compared to single-lane roundabouts. The same research made it very clear that it is safer for cyclists not to have priority over motor vehicles on the roundabout, than to have it. At least 70 have been built in the Netherlands, while many turbos (or similar, lane splitting designs) can be found in southeast Asia. Alt URL The turbo roundabout design is given as an example in the federal Manual on Uniform Traffic Control Devices.