Description: Shows statewide centerlines excluding areas covered by Regional Board 2 and Los Angeles Trash TMDLs. Uses Caltrans NAD83 coordinate system (meter) obtained from Caltrans Webmapping SDE. Highways are represented as centerlines, but contain directional information. South and west directions must be symbolized separately using the LCombinedScore attribute. North and east directions must be symbolized separately using the RCombinedScore attribute.