The European norm EN 124 of 1994 applies to manhole and storm drain tops with a clear opening up to 1 m for areas subjected to pedestrian or vehicular traffic (covers with a clear opening over 1 m are specified in the British Standard BS9124 for example).[30] EN 124 specifies several weight classes depending on the application and is also being used in some countries outside the European Union. The lightest class A15 (cast iron) manhole cover can withstand a maximum weight of 1.5 tonnes. It would typically be restricted to light duty applications in pedestrian areas, gardens, patios, driveways and similar. By contrast, the heaviest class F900 manhole cover can withstand a maximum weight of 90 tons, making it suitable for docks, airports, and other extreme heavy-duty applications.[31]
Environmental considerations also play a significant role in the discussion surrounding bike racks. With sustainability as a growing global concern, bike racks align seamlessly with eco-friendly initiatives. Promoting cycling as an alternative to motor vehicles aligns with efforts to reduce greenhouse gas emissions and combat climate change. By facilitating easier access to biking, bike racks contribute to a more sustainable future for our cities and communities.