To protect emergency and highway personnel, Indiana law requires motorists to approach cautiously when an emergency vehicle is stopped on two or four lane roadways with emergency lights flashing. 

Change lanes away from the emergency vehicle if you can do so safely. If not, reduce your speed 10 mph under the posted speed limit and proceed with caution. Motorists should not stop in the roadway; this may cause a chain reaction rear end collision with other vehicles. Do move over and/or slow down. As you are driving, plan well ahead by watching for these vehicles: 

• Police vehicles
• Ambulances
• Fire trucks and rescue equipment 
• Highway incident-response vehicles
• Highway maintenance vehicles
• Utility service vehicles
• Vehicle recovery equipment (tow trucks)

Violating the law can result in a fine and your license will be suspended up to two years if you cause damage to emergency equipment or injury or death to an emergency worker. 

Source: in.gov