Indiana Code Title 9. Motor Vehicles § 9-21-5-9

(1) on a roadway that has two (2) or more lanes of traffic in each direction; and

(2) in the left most lane, other than a lane designated for high occupancy vehicles.

(1) when traffic conditions or congestion make it necessary to operate a vehicle in the left most lane;

(2) when inclement weather, obstructions, or hazards make it necessary to operate a vehicle in the left most lane;

(3) when compliance with a law, a regulation, an ordinance, or a traffic control device makes it necessary to operate a vehicle in the left most lane;

(4) when exiting a roadway or turning to the left;

(5) when paying a toll or user fee at a toll collection facility;

(6) to an authorized emergency vehicle operated in the course of duty; or

(7) to vehicles operated or used in the course of highway maintenance or construction.