Hatching issue

Hi, 

I am hatching sidewalk on a long and curvy street. As I am using a type of unit pavement for my hatch, it twists wherever there is a degree of angle.

I am currently trying to cut the whole length into smaller pieces to give me smoother hatch but I wonder if there any other way to that ! Something that I could define or introduce the boundary and set it up to hatch perpendicular based on boundary.

Thanks,

Iman