I was standing there to take these photos (photo 1, photo 2) and the ambulance just happened to pass by when I had all the settings ready for this type of shot. It was all just good luck and timing 😄
I set the exposure time to 6 seconds and used a very small aperture. The ambulance being too dark and also moving too much makes it not "stick" on the photo. But the flashing blue lights stick despite moving because they emit a lot of light. You can also see the people in the background were not completely still, so they are all blurry.