This mandatory direction sign signals a compulsory roundabout, requiring you to follow the indicated path to ensure traffic order and safety. Mastering its meaning is crucial for your Icelandic theory test revision and navigating junctions correctly.
Roundabout is a mandatory sign used where traffic has to move in a particular way to stay safe and orderly. It often appears at islands, central refuges, one-way arrangements, path networks, and places where separating traffic streams matters more than driver preference. The sign should be read together with arrows, lane markings, kerbs, and the physical road layout because those details show exactly how the instruction is applied on site. Ignoring a mandatory sign can place you into direct conflict with opposing traffic, pedestrians, cyclists, or a protected part of the road space.
This sign makes roundabout circulation compulsory for the road user or lane concerned. You must follow the direction, side, or path shown instead of choosing your own line through the location.
A clear reference image of the 406 - Roundabout road sign used in Iceland.

The 406 - Roundabout road sign may also be known by these alternative names or terms.
The 406 - Roundabout road sign is part of the Mandatory Direction Signs category, which groups together signs with similar rules and functions.
Comparing this roundabout sign with similar mandatory direction signs aids memory and reduces confusion, crucial for your theory test revision. Effective traffic sign comparison sharpens your recognition skills for safer driving in Iceland.
After reviewing the full list of Icelandic road signs, reinforce your learning with targeted practice. Explore our sign group categories or take a specific quiz to test your recognition and recall. Ensure you're fully prepared to identify and interpret all traffic signs for your upcoming driving theory exam.
View All Icelandic Road Signs