Driving Reminder - Don't Hang Out in the Passing Lane
RSMo 304.015 Drive On Right of Roadway
All vehicles in motion upon a highway having two or more lanes of traffic proceeding in the same direction shall be driven in the right-hand lane except when overtaking and passing another vehicle or when preparing to make a proper left turn or when otherwise directed by traffic markings, signs or signals.
Original source can be found here.
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