Jew in London

There is an alley way behind where I work in the evenings. Sometimes I have to park there because there is no space out front. I know it is an alley way, but why do people think that alley ways are for peeing? In my house we were brought up that you pee in the toilet (after pottie training training of course). Walking to my car on these days is only possible by holding your breath till you drive away to safety.

I thought that if they put up these signs then there might be a chance that I won;t turn blue every time I have leave work.