Developments:

Late last night, my taxi home was stopped by three soldiers at a checkpoint. They checked the car over and examined the driver's license. Both car and license were fine, but the soldiers demanded a 5,000-cedi bribe to let us go. 5,000 cedis is about 30p - 20% of the fare. The driver paid up, explaining, "if you don't pay, they spend more time on you."