How to smooth Roads Matching Topography

Hi everyone.I use dynamo to create roads and sidewalks matching topography.But I got bumpy surfaces because of bumpy topography.And when I assign material I got some weird apperances.İs tehre any way to smooth these floor or roof elements .Or is there any way to smooth topography.Or any other suggestions to fix it.!
Screenshot_5|664x500

İs not there anyone having an idea

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