ARRIVING at the airport in Senegal’s capital, Dakar, you have a fair chance that the newish-looking taxi taking you into town will not be the usual French or Japanese model, but Iranian. And it will not have been imported, as most cars in Africa are, but assembled in nearby Thiès. From here, the first few hundred taxis have just come off the production line at an Iranian-built Khodro plant. They are tangible symbols of a new power in sub-Saharan Africa that has, for some, begun to cause ripples of concern.