Turbo roundabouts are an innovative intersection design developed in the Netherlands in the late 1990s. Unlike traditional multi-lane roundabouts, where vehicles can change between lanes within the roundabout, turbo roundabouts use raised lane dividers and lane markings to guide vehicles into specific paths before entering the roundabout. This eliminates lane changing within the roundabout itself, enhancing safety and capacity. The main features of turbo roundabouts include:
- Spiral Lane Layout: Vehicles are guided through dedicated lanes that spiral outward, reducing some of the additional conflict points brought into a multilane modern roundabout.
- Physical Lane Separation: Raised curbs or markings prevent lane changes within the roundabout.
- Higher Capacity: Turbo roundabouts are designed for multilane intersections and can handle greater traffic volumes when single-lane roundabouts are not sufficient.
These characteristics make turbo roundabouts ideal for locations with high traffic volumes, complex turning movements, or safety concerns.
Sain’s Role in the McCalla, Alabama Turbo Roundabout
The McCalla, Alabama area has experienced significant development, especially with the growth of nearby industrial facilities and the presence of major freight corridors. With increased truck traffic, congestion, and safety concerns, the T-intersection along Old Tuscaloosa Highway would prove to be insufficient. A roundabout was selected as the appropriate alternative intersection design. However, with the complex mix of volumes and vehicle types, Sain and the County opted for the Turbo design to move vehicles safely and efficiently through the corridor.
Watch the video below to learn how to navigate this unique turbo roundabout design.
Turbo roundabouts represent the next step in intersection design, providing safer and more efficient traffic flow solutions. Contact us to learn more about potential intersection improvements for your next project!