Linear feature #### Highway = Secondary:
Zilla roads (Secondary roads) are the classification for all secondary roads in Bangladesh as defined by the Roads and Highways Department of the Ministry of Communications (RHD). For a breakdown of the proposed road conventions in Bangladesh please reference the Bangladesh OSM wiki.
Zilla roads are paved or have a hard packed surface roads. Zilla roads are more narrow in width than Regional Highways, can can be hard to trace due the tree canopy adjacent to the road. During seasonal flooding events Zilla roads can flood and become very muddy or impassable.
For additional information reference this list of roads and highways in Bangladesh.