yield to the emergency vehicle
move to the side and let the police, ambulance, or fire fighter car go through
Diffraction causes you to hear the ambulance on the other side of the building, even if you can not see it.
The word "siren" comes from Greek mythology. In the Odyssey, the sirens were singing monsters that lured sailors to their deaths with their sumptuous voices.
Pull to the side of the road so it can go past you.
The protocol for drivers who hear police or ambulance sirens, in America at least, is to pull one's car over to the side of the road and stay idle until the cop car or ambulance is safely ahead.
The wavelengths of the sound are compressed, making them shorter, and thus the frequency (and the pitch) higher. So the person in the oncoming car hears the siren operating at a higher pitch than the ambulance driver hears the same siren. This phenomenon is known as the Doppler effect.
a police siren!!
Figure out where the siren is coming from and get out of the way of the emergency vehicle by pulling over or moving out of the way.
the ambulance is going to the hospitalthe ambulance has its siren onthe ambulance is moving (:PJHS
It is illegal but maybe you can buy it from someone who stole it from the ambulance, or maybe the people who build the ambulance siren is kind and give it to you. But it is not legal at all.
Both are warnings of potential trouble.
not long at all, you need to move over right away