In Downtown Cairo cement walls block nearly every main street. Manoeuvring around the obstructions has become such a chore that many people avoid the whole neighbourhood. But Egyptians will find ways to deal with anything, in this case by drilling a hole.
The walls show the complete disregard of the government for the rights of citizens. It would rather subject them to being humiliated by crawling through a hole than make their lives easier. It also shines a whole new light on a famous statement Tareekak masdood (your road is blocked), uttered in one of the most famous Egyptian plays, EL eyal kebret (the children have grown).