It appears from some safari trip reports that there is only one person who functions as the driver and guide on the safari. Several websites that list their employees also identify many as "Driver Guide" or "Driver/Guide".
Do these DGs perform one role or both on a given safari? Does that depend on the number of passengers in a safari vehicle? If a DG is both D and G, how is one to interpret the suggested tipping amounts for Drivers and Guides? Add the 2 amounts if D&G is one individual or something else? We're not expected to text while driving here. Can they guide while driving in TZ? ;-)