As of July 1, 2023, Indiana's 'Move Over or Slow Down' law was amended. 
The law now requires that all motorists move over or slow down when approaching a disabled vehicle (with flashing hazard lights activated).
The ‘Move Over’ law originally only protected emergency vehicles stopped on the side of the road. Drivers also can’t stop, stand, or park on the side of an interstate unless it’s an emergency.
Drivers who fail to switch lanes when approaching a disabled vehicle on the side of the road that has its flashers on could receive a class B infraction.
This goes for drivers on all Indiana roads, including two-lane roads where moving over a lane might not be possible. In this case, or in the event you can’t safely switch lanes on a four-lane road, drivers should slow down to 10 mph below the speed limit to avoid a violation.