Traffic-Line Trench CoverTRAFFIC LINE Trench Covers are available in two grades of material, Blow Moulded HDPE and GRP. The HDPE version is lighter to handle and has a SWL of 400kg, whilst the GRP version is a heavier duty model and features a SWL of up to 700kg. Both types are non rusting moulded panels enabling access across excavations. TRAFFICLINE Trench Covers have anti trip edges and feature non slip surfaces as standard. The HDPE version has the added advantages that