In many states it is the law that you must move over and/or slow down when going past an emergency or construction vehicle on the side of the road. You can receive a ticket if you do not. We have a policy in Leather & Lace about this and here it is:
For the purpose of this policy, an emergency vehicle is any police, fire, tow truck or construction vehicle that has flashing lights and may be stopped along the edge of the roadway.
When coming up on an emergency vehicle on the side of the road (along the lane you are traveling in) with its emergency /warning lights in operation, the pack should be moved to the next lane over, if possible. If it is not possible to move to the next lane, the pack should be signaled into single file formation along the lane edge farthest away from the emergency vehicle, and slow down as they pass. Once you are past the stopped emergency vehicle you may then resume your previous formation and speed.