Machine Guns and the Visually Impaired

In most modern cities, there is an acoustic ingredient to cross walk lights to aid the visually impaired (that is blind people in politically correct parlance). Most of us are used to the chirp chirp ones in Canada. Latvia is no different than the rest of the modern world, but they do things with a bit of a twist.. The DO NOT WALK acoustic signal is a clicking sound. It sounds mechanical, similar to the clicker when we activate turn signals on our car, but much louder. The walk signal is where the twist comes in. The sound is still that same mechanical sound but the frequency intensifies.. It quickens to the pace of machine gun fire. If you close your eyes and imagine any WW II movie and think about machine gun fire, you have the sound. I am wondering what someone who lost their sight later in life thinks about this.. Standing at a cross walk and suddenly hearing machine gun fire... Scramble quickly across the street and duck for cover? For a country that has a history of being occupied for most of the last 1500 years, I am wondering if it is something in the subconscious of the people.. Do most acoustic warnings in this country sound like machine gun fire? Does your alarm clock sound like a machine gun?