I don't know about other states, but in Florida, left-lane cruising is both inappropriate operation of a motor vehicle, and technically illegal. The left-most lane of any highway is strictly for overtaking other vehicles.
A person who is cruising in that lane, whether or not they are preventing other vehicles from overtaking it, is in clear violation of traffic rules for use of the left lane.
Anyone who respects the law and the rules of traffic should be staying out of the left lane unless executing a passing maneuver.
Quote:
316.083 Overtaking and passing a vehicle.—The following rules shall govern the overtaking and passing of vehicles proceeding in the same direction, subject to those limitations, exceptions, and special rules hereinafter stated:
(1) The driver of a vehicle overtaking another vehicle proceeding in the same direction shall give an appropriate signal as provided for in s. 316.156, shall pass to the left thereof at a safe distance, and shall not again drive to the right side of the roadway until safely clear of the overtaken vehicle. The driver of a vehicle overtaking a bicycle or other nonmotorized vehicle must pass the bicycle or other nonmotorized vehicle at a safe distance of not less than 3 feet between the vehicle and the bicycle or other nonmotorized vehicle.
(2) Except when overtaking and passing on the right is permitted, the driver of an overtaken vehicle shall give way to the right in favor of the overtaking vehicle, on audible signal or upon the visible blinking of the headlamps of the overtaking vehicle if such overtaking is being attempted at nighttime, and shall not increase the speed of his or her vehicle until completely passed by the overtaking vehicle.
(3) A violation of this section is a noncriminal traffic infraction, punishable as a moving violation as provided in chapter 318.
And:
Quote:
316.081 Driving on right side of roadway; exceptions.—
(1) Upon all roadways of sufficient width, a vehicle shall be driven upon the right half of the roadway, except as follows:
(a) When overtaking and passing another vehicle proceeding in the same direction under the rules governing such movement;
(b) When an obstruction exists making it necessary to drive to the left of the center of the highway; provided any person so doing shall yield the right-of-way to all vehicles traveling in the proper direction upon the unobstructed portion of the highway within such distance as to constitute an immediate hazard;
(c) Upon a roadway divided into three marked lanes for traffic under the rules applicable thereon; or
(d) Upon a roadway designated and signposted for one-way traffic.
(2) Upon all roadways, any vehicle proceeding at less than the normal speed of traffic at the time and place and under the conditions then existing shall be driven in the right-hand lane then available for traffic or as close as practicable to the right-hand curb or edge of the roadway except when overtaking and passing another vehicle proceeding in the same direction or when preparing for a left turn at an intersection or into a private road or driveway.
(3) On a road, street, or highway having two or more lanes allowing movement in the same direction, a driver may not continue to operate a motor vehicle in the furthermost left-hand lane if the driver knows or reasonably should know that he or she is being overtaken in that lane from the rear by a motor vehicle traveling at a higher rate of speed. This subsection does not apply to drivers operating a vehicle that is overtaking another vehicle proceeding in the same direction, or is preparing for a left turn at an intersection.
(4) Upon any roadway having four or more lanes for moving traffic and providing for two-way movement of traffic, no vehicle shall be driven to the left of the centerline of the roadway, except when authorized by official traffic control devices designating certain lanes to the left side of the center of the roadway for use by traffic not otherwise permitted to use such lanes, or except as permitted under paragraph (1)(b). However, this subsection shall not be construed as prohibiting the crossing of the centerline in making a left turn into or from an alley, private road, or driveway.
(5) A violation of this section is a noncriminal traffic infraction, punishable as a moving violation as provided in chapter 318.
