---
title: "Protected Intersection"
url: "https://commonwaysystem.org/patterns/intersections/protected-intersection/"
id: "INT-PRI-11"
description: "A Dutch-style intersection treatment using corner refuge islands and setback crossings to reduce conflict between turning vehicles and people walking or biking."
updated: "2026-09-26"
---

# Protected Intersection

`INT-PRI-11`

Recommended Intersections & Crossings

Protected Intersection

A Dutch-style intersection treatment using corner refuge islands and setback bicycle/pedestrian crossings to reduce conflict between turning vehicles and people walking or biking through the intersection.

## 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.

Aligned

### [Are Streets Too Complicated Now?](https://www.youtube.com/watch?v=u1Xs5EA5_uU)

City Beautiful

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.

Aligned

### [Dutch-style intersection design: bike-friendly](https://www.youtube.com/watch?v=yCzi1Q4xCTA)

BicycleDutch

Shows the protected-intersection design vocabulary, continuous cycle tracks, corner refuge islands, separated signal phasing, that underpins CS's Protected Intersection pattern and the Corridor retrofit paths built around it.

Aligned

### [Roundabout with safe cycling facilities (Netherlands)](https://www.youtube.com/watch?v=-VapKuLqJ9M)

BicycleDutch

A visual tour of a Dutch roundabout built with protected cycling facilities. It serves as a real-world reference for the Commonway System's roundabout and protected cycling intersection patterns.

Counterexample

### [These Intersections Should Be Illegal](https://www.youtube.com/watch?v=KGoV74jtE3Q)

Streetcraft

The video analyzes four badly designed American intersections, including an awkward roundabout and highway ramps that strand bike lanes. It is a cautionary companion to the Commonway System's intersection and cycling patterns, showing what failure looks like.

Aligned

### [Bike lanes are not good enough](https://www.youtube.com/watch?v=p36skNda3KE)

City Beautiful

The video argues that painted bike lanes fail and shows what works instead: cycle tracks, protected intersections, advisory lanes, plus a road-diet case study. It makes the case for the protected cycling facilities the Commonway System's bike patterns specify.

Typical at: Compact Urban Core

Suburban is an edge case. Undeveloped and Rural contexts are an unlikely pairing.

## Design notes

The first addition to Intersections & Crossings since the original ten. Addresses a specific, well-documented failure mode of conventional intersections, insufficient separation between turning vehicles and through bicycle/pedestrian traffic, that no other pattern in the set directly solves.[1]

Corner islands should provide genuine physical refuge, not a painted buffer alone. Crossing setback distance should give turning drivers a clear sightline and adequate reaction distance to pedestrians and cyclists.

Compatible with, and often paired with, [Roundabout](https://commonwaysystem.org/patterns/intersections/roundabout.md) (INT-RAB-01) as the default intersection treatment.

## Turning trucks

Vehicles making a turn are involved in a disproportionate share of fatal pedestrian and cyclist crashes relative to vehicles going straight, and that risk rises sharply with vehicle size.[2][3] See [Signal](https://commonwaysystem.org/patterns/intersections/signal.md) for the general pattern.

Where a truck route runs through this intersection, setting the bicycle stop bar back keeps a cyclist waiting at the intersection out of a turning truck's swept path. Where a bicycle signal phase exists, separating bicycle and truck turning movements in time, not just space, closes the gap a setback stop bar alone cannot.[4]

## Related patterns

-   [Roundabout (Single/Multi-Lane)](https://commonwaysystem.org/patterns/intersections/roundabout.md) (INT-RAB-01)

## References

1.  Precedent-based [Falbo, Nick, "Protected Intersections for Bicyclists," ProtectedIntersection.com (2014).](http://www.protectedintersection.com/)
2.  Evidence-based [U.S. Government Accountability Office, _Pedestrian and Cyclist Safety: DOT Should Take Steps to Address Risks Related to Limited Driver Visibility_, GAO-26-107954 (2026).](https://www.gao.gov/products/gao-26-107954)
3.  Evidence-based [Wang, Q. et al., "Exploring the Influencing Factors and Formation of the Blind Zone of a Semitrailer Truck in a Right-Turn Collision," _Sustainability_ 14(16), 9805 (2022).](https://doi.org/10.3390/su14169805)
4.  Precedent-based [Seattle Streets Illustrated, 3.11 "Freight" (setback bike lane stop bars and bicycle signals as tools against large-truck turning movements).](https://streetsillustrated.seattle.gov/design-standards/freight/)