Various
The ultimate manhole covers site
Standard of the Austrian Standards Institute (ASI) for the manhole covers in the areas of vehicles and pedestrians.

The standard is actually equivalent to the European standard EN124 ( )
The standard is also known as the B5124 standard (older name)

Download the standard from the ASI site (payment) https://shop.austrian-standards.at/action/en/public/details/174747/OENORM_B_5110-1_2004_03_01

An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.
There are 51 manhole covers in the site that has this standard
Click for all the covers with this standard

Click for the rest of the standards in the site

The ultimate manhole covers site

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