Automated excavating uses automated dozers and other earthmoving equipment to move material at a worksite. Some areas of the worksite may require that control of the automated dozer revert to manual control, such as a spread zone near a crest. A controller monitors the position of automated dozers and adjusts an operating characteristic of an individual automated dozer so that there are not more dozers in the zone than there are operators to manually control them. The adjustment made may depend on the blade loading of an individual dozer, particularly so that a dozer with a loaded blade is not brought to a complete stop, which may cause undue wear on the dozer when re-starting.