||Not many words needed for this one :
the sign belongs to the wide-spread UK-sign family.
If you are a newbie you'll probably want to do some
reading about this group of road-signs in Iceland,
Egypt or Great Britain.
Our find from Isiolo is probably the precursor of the modern UK design.
We're looking at a brave girl guiding her younger brother.
The detail in the drawing is typical for older road signs and
such that his choice of clothing is clearly visible: shirt and shorts.
It's still a mystery why children on modern roadsigns (are asked to) drop
their clothing. It's even more of a mystery that no parent seems worried
by this behaviour — see also Canada.