HNOKAY HD+ nstruction Mats Support the Heaviest Loads Over the Toughest Terrain in the Most Challenging Environments. HNOKAY HD+ heavy-duty mats are designed specifically for high-traffic work sites, such as power transmission, oil rigs, and nstruction sites. HNOKAY HD+ mats create a stable work platform or temporary roadway in extremely soft and wet ground nditions.