If I undertook a street survey and asked passers-by how much they weighed or how tall they were, the answers I would get back would be dependent on what system of weight and measures a person was brought up on and was familiar with. Grandparents would most likely answer in imperial units (pounds, feet & inches), and their grandchildren would reply in metric units (kilograms and metres), the reason for this is that South Africa converted to the metric system in the early 1970’s.
It is hard to believe that it has only been a few decades since South Africa adopted the metric system. The shift had a profound impact on the economy and the daily lives of citizens. Many of South Africa's largest trading partners at the time were either using the metric system or had committed to moving over. This provided the impetus for South Africa to get going. The strength of the apartheid state ensured that implementation was highly effective.