[Tagging] Extremely complicated conditional values

[Paul Johnson]

Is there a condition value calculator that can help me come up with sane
tagging for this?

https://openstreetcam.org/details/955279/18672/track-info

This is a chart of advised speeds in MPH for HGVs on a motorway in Oregon
based on weight in pounds.  I'm at a complete loss of how to tag for this
save for conditional values but I am banging my head on coming up anything
cogent reading through
https://wiki.openstreetmap.org/wiki/Conditional_restrictions short of
maxspeed:advisory:hgv=18
mph (which technically fits the most stringent value but a little hamfisted
given that sign).

Can I get a hint on this?
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