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Mandatory Signs


Signatories of the Vienna Convention define the mandatory sign design as circular in shape with a blue or white background. White signs will have a red border, while blue signs will completely blue with no border. You will see mandatory signs as you approach roads that only allow certain types of vehicles, roads that require equipment, or signs that point the way around road work or traffic islands. When approaching any of these areas, be sure to only follow the signs that are appropriate for your vehicle.

Examples of mandatory signs:

Snow Chains Required Winter equipment in the form of snow tires or snow chains are required, vehicles without this equipment are subject to fines or citations.
Pass on the Right Approaching the pass by on right sign indicates that passing a work zone or traffic island on the right hand side is mandatory.
Pedestrians and Biks Only Only pedestrians and bicycles may use the route, no motorized vehicles are allowed.
No Passing There is no passing or overtaking of vehicles for the duration of the no passing zone.
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