Yes it is called the move over law.
Im
They have mirrors in order to be able to see around them. The ambulance is a large emergency vehicle. It is often necessary that the proceed to the emergency room of the nearest hospital as quickly as they can in a safe manner. The mirrors allow them to merge in traffic and navigate through tight areas in order to get to a patient or to get the patient to the hospital.
In the US - in most (all?) states that I am aware of - the law requires that, on an un-divided highway, you "Yield the Right-Of-Way" to emergency vehicles. Ambulance and Fire Truck drivers can take down your license plate numbers and you can get a ticket or fine for not yielding to them.
They merge your momentum with that of the entire vehicle.
emerge, gene, merge, geme, creme,
Slow down, check side/rear/blind spot to see if the lane beside you is clear, put on your turn signal, merge to the lane away from the stopped emergency vehicle. However, be prepared to come to a full stop if needed or directed by emergency personnel. Do not gawk-- keep your eyes on the road. Looking at accidents is a sure way to cause another accident.
200 feet
Merge into is more correct.
EMERGENCY emerge, energy, eye, eery, germ, gene, green, gen, gee, greener, mercy, mere, merge, men, me, my, rem, rye, regency, rec, reg, ye, yen
of Merge
A merge sign is a sign that instructs road users to merge.
Merge - 2003 Merge 3-3 was released on: USA: 12 February 2005