It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
OPS have been in use since 1984. The Ontario Provincial Standards Unit, part of the ministry's Design and Contract Standards Office of the Provincial Highways Management Division, manages the development and production of construction drawings, construction and material specifications, and contract tendering documents for road works. Additionally, the unit has responsibility for channelling Ontario road products evaluation through external agencies and liaising with an external sources registry holder.
A scientific information search engine, "...it allows researchers to search for not only journal content but also scientists' homepages, courseware, pre-print server material, patents and institutional repository and website information."