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This details the steps needed to resize highway marker symbols in ArcMap.
If you are working with marker symbols as graphics or as annotation in the map, first select the markers you want to edit, right-click on any of the selected markers, and select Properties. Click Change Symbol in Text Properties. Then follow the steps below.
If you are working with marker symbols for labels, right-click on the layer in the Table of Contents and select Properties. Select the Labels tab in Layer Properties. Click Symbol in the Labels dialog. Then follow the steps below.