I pulled myself together and continued driving, while listening to the instruction from the officer. Just when I felt relieved and everything was going well, I heard a siren. It was a fast ambulance approaching from behind, which got me all nervous again because the road was so slim that I couldn't move to the right to provide enough space for the ambulance to pass. Suddenly, I started accelerating to keep a distance from the ambulance and hoped eventually it would turn at some other street. Luckily, the ambulance did disappear from my rearview mirror; I guess it did turn somewhere. I've always tried to figure out why I chose to speed up, instead of waiting for the officer's instructions, but I never found an answer.