I have no need to google as I know exactly what it's about.
Blue lights are there to bring your attention to the fact there is an emergency vehicle behind you and you should try to facilitate it's journey in a law abiding fashion. If you are at a red traffic light, there is a very great danger in going through it (just watch any Russian Drivers video n the tube) you will cause a crash, further holding up the emergency responders.
However, if you can see & hear the vehicle, he may be in breach of guidelines as as far as I am aware, if they are already in a queue of traffic, they should not have the sirens on in stationary traffic.
What I was talking about is the times I have been on a narrow, windy road where I considered it to be unsafe for me to pull over or them to pull out to pass. I have been at a red light when a fire engine was in the near distance, but by the time he got closer, the lights had changed and I was able to drive forward and into a space to allow him to pass....along with a taxi driver who perhaps had delusions of being a lawyer