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I think we should recommend to use the three letter ISO 4217 standard currency codes ( instead of the one unicode characters. So $ should be USD, € should be EUR, etc. Many currencies don't have character symbols at all.

Also we should expect to have a space between the amount and the currency code.

Amount should be used in US format, so using . (full stop) as the decimal mark to separate the integer and fractional parts.
Apostrophe ' would be optional to separate thousands.

So the examples would look like:
charge=May - October Mo - Sa 8:00 - 16:00 1.5 EUR/2h
charge=16 USD/hgv; 8 USD/motorhome; 6 USD/motorcar
charge=4 USD/person/day; 12 USD/person/week; 0 USD/child < 14years
charge=1'000 USD/day
charge=10.25 EUR/adult


Agree. Please add your signature in future. --MeastroGlanz (talk) 11:34, 1 August 2017 (UTC)
Am I allowed to change the wiki page according to this or should I wait for confirmations from others? --AndrasFuchs (talk) 06:28, 2 August 2017 (UTC)
I agree with three letter currency codes.
I think the currency code should be before the amount, as that is the custom in BrE (which is OSM convention) and apparently widely used
If we're following conventions, might as well follow SI convention: dot for decimal separator (because BrE) and space for thousands.
Finally, I think subkeys would be more appropriate for certain types of fees, something like a specific format for toll booths (in response to charge=16 USD/hgv; 8 USD/motorhome; 6 USD/motorcar)
--Tqdv (talk) 09:52, 7 January 2018 (UTC)