The RoadL_Rep layer is symbolized with the RoadL_Rep feature class representation, which contains four representation rules. These four rules have been translated from the four symbol categories present in the original symbolized layer from which the feature class representation was derived.

Click the third representation rule, Class 2, in the list. The right side of the dialog box shows the properties of that representation rule.

The Class 2 representation rule consists of three stroke symbol layers, indicated by the three stacked tabs showing a stroke squiggle.

Click the first (topmost) stroke tab in the list of symbol layers. This symbol layer includes the Dashes geometric effect to place red solid lines in alternating intervals along the linear geometry of the feature. This symbol layer is at the top of the symbol layer stack for this rule, so it is the last to draw and therefore appears above the other two symbol layers.

Click the second, then the third stroke symbol layer tabs in this representation rule. Neither of these symbol layers includes a geometric effect. The bottommost symbol layer is a solid, thick black line and is the first to draw. The second symbol layer is a slightly thinner, white line. Together they give the appearance of a cased line symbol.