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While not required, if the motor carrier configured the driver user account to authorize a special driving category, then the graph-grid will overlay periods using a different style line (such as dashed, dotted line, or shading) in accordance with section 4.8.1.3(c)(1) of the ELD Functional Specifications. The appropriate abbreviation must also be indicated on the graph-grid.
If the motor carrier does not configure the driver user account to authorize special driving categories, then the driver must annotate the beginning and end of the applicable special driving category.