In Namibia, just like in the rest of southern Africa (see some examples below), the girl is in control
We might have thought this behaviour is rooted in a matriarchal society, but it is
a way of doing that stems from the kolonial past. These signs belong to the UK-group
(found in Great Britain
and many related countries)
where the girl, contrary to many other countries, takes the lead.
As a rule in this UK-group the girl drags the boy onto the road.
In Zimbabwe however the girl shows a more responsible behaviour
and she keeps her brother (is he?) from running into the trafic.