Engineered for demanding applications, our D400 manhole covers are the industry standard for carriageways, main roads, motorways (subject to traffic volume), hard shoulders, and busy parking areas These heavy-duty manhole covers are built to withstand constant, high-speed traffic from all types of vehicles, including HGVs - withstanding up to 40 Tonnes. When you need robust access solutions for high-traffic roads and commercial zones, our D400 covers provide exceptional performance and longevity.