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In Europe and other places, there are similar intersections. These may be marked by special signs (according to the Vienna Convention on Road Signs and Signals), a danger sign with a black X representing a crossroads. This sign informs drivers that the intersection is uncontrolled and that default rules apply. In Europe and in many areas of North America the default rules that apply at uncontrolled four-way intersections are almost identical:

  1. Vehicles turning left must also give priority to traffic approaching from the opposite direction, unless that traffic is also turning left.
  2. If the intersection is congested, vehicles must alternate directions and/or circulate priority to the right one vehicle at a time.[citation needed]