Turbo-Roundabout
INT-TRB-02 Turbo-Roundabout
Related Media
The items below come from outside the Commonway System, external videos, podcasts, and articles related to this page's topic, not part of the guidebook itself.
Are Streets Too Complicated Now?
Asks whether today's proliferation of lines, signals, and lane types on streets is overcomplication or a needed response to modern demands, a question that runs directly through CS's Element-scale catalog and the density-tiered Corridor retrofit paths this video is tagged to.
America Built the Wrong Roundabout (The Dutch Didn't)
Traces the turbo roundabout's origin and safety data, but also reports the Fietsersbond's documented cyclist/pedestrian crossing hazards at turbo roundabouts directly, worth noting since it complicates a clean "aligned" label.
Typical at: Compact Urban
Suburban and Core are edge cases. Undeveloped and Rural are unlikely pairings.
Design notes
Reserved for higher-volume Arterial-to-Arterial junctions, where a standard roundabout's capacity is not enough but a signal is still not the preferred default. This keeps the roundabout-first philosophy intact at higher volumes rather than defaulting to a signal once traffic grows.1
Related patterns
Roundabout (Single/Multi-Lane) (INT-RAB-01) (the base pattern this scales up from), Signal (INT-SIG-03) (explicitly named on this page as the alternative not preferred even at these volumes)
Getting there: Retrofit path options
Signal-to-roundabout conversion (RFT-INT-01)