A fire truck came up behind me while driving and just laid on the air horn. Why are they so rude?

Indiana State law requires that motorists pull over to the right when designated emergency vehicles (fire trucks, ambulances and police units) are responding. That being said, many motorists either stop in the lane of traffic, pull to the left or completely ignore our warning devices. The driver of the emergency vehicle has a great responsibility to the residents and our personnel to use extreme safety measures when driving. If motorists DO NOT pull to the right to allow us to pass, it puts the driver as well as the crew in danger. The only device we have to let the motorist know to move is the air horn. In summary, please pull to the right when lights and sirens approach you from the rear and yield to the emergency vehicle.