You could also try defining the frontage road corridors by selecting the mainline alignment as the Corridor Baseline, then assign the frontage road centerlines as point controls to move the templates over to the correct location (i.e. assign the frontage road centerline to the CL point in your template for both horizontal and vertical). This would allow the template drop interval to be controlled by the mainline, but the location of the templates defined by the frontage roads.
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