I did it! I bought a moped. It has a four stroke-engine, a semi-automatic gear box (I have to shift but no clutch) and a zippy little basket on the front for my purse and bottle of Pellegrino or whatever.
I've bought it in Yei and am now convincing someone to bring it down to Juba on truck on Saturday. At which point I will be the happiest, freest girl in ALL of Sudan-land. It has been a very VERY good day.