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OK. Understood. It sounds like your curb and asphalt are at different elevations. For example, the road surface is 100'-0" above mean sea level and your top of curb is 100'-6" above sea level.
In cases such as this you'll need a closed polygon for the road surface and another closed polygon for the road surface. You need to separate the surfaces because each surface is at their own elevation, one being 6" higher than the other.
Think about it. If the surfaces have a 6" elevation difference how do you hatch the transition from road surface to top-of-curb? The transition, that surface, is the face of the curb and the face is a completely different polygon, not the top of curb and not the road surface. The curb's face isn't even visible from plan view.
The only alternative is to FLATTEN all your lines so they reside at say, 0'-0" above sea level, and I don't think you want to do that. Do you?
Chicagolooper