This white sign means:

Question

A white, rectangular sign indicates that you must obey important rules. This sign means that drivers should allow the left lane to remain open, when possible, for passing and for faster traffic.

Accepted Answer

Stay in the right lane if you are driving more slowly than other traffic.

Answer

You should slow down and move to the right lane.

Answer

Slower traffic must exit on the right.

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This white sign means:

Wait, before you go