Presidential motorcade

Today when I was in my car on my way at home I saw presidential motorcade. There were about 7 or more cars in this motorcade. All trafic was blocked by policemen and people in black cars with plates of FSB. It happened about 7 pm. A lot of cars (may be hundred or thousand) were gathered in the street. All drivers were calmly waiting while motorcade will pass away. This picture I see periodically on the street. I think if it possible only in our country that one of us can drive quickly on the street while other people should stay and waiting or it happens in all over the world. When I was in Sankt Petersburg I saw the similar situation. But I noticed one different. Policemen gathered a lot of cars when he stopped traffic. But when motorcade had came all drivers in this column started to press a horn. It was so noisy at that moment!