In terms of road traffic deaths, Iran is the third worst country in the world. By the age of 14 I was run over 3 times in the streets of Tehran, once I was almost killed. I still have the scar.
And the Iranian government knows this. They try to warn drivers, to no avail.
Here is a report about car accidents inside one of Tehran’s tunnels, called Towhid. Every day 70,000 cars go through it, and every day they register 400 cases of people breaking road regulations. And the result? see for yourself. Does it look like any of the drivers are driving at the 60 KM/hour speed limit?