What is wrong with directing traffic manually at construction sites? — answered by Engineer Saeed Baatiah
Placing a person in the Riyadh summer afternoon to wave a flag at oncoming vehicles is a double risk: heat stress that can escalate to heatstroke, and direct collision exposure. The task itself is purely repetitive — raising and lowering a sign on a fixed pattern — which is exactly the class of work machines have outperformed humans at for decades. The problem is not the worker but assigning a mechanical, hazardous task to a human body without need.