External Noise Generator

[AK OK]

I was following a pedestrian in Tesco’s car park yesterday who was walking in the middle of the road. They were completely oblivious to the fact that I was there. I did not want to beep the horn, although I had the windows open I could not hear anything.

In the end they realised that I was there but I think that the noise needs to be louder.

Just call out "excuse me" ?