Yes Toyota is the only one still being hard to tell. Hopefully they will see the benefit at some point as well.
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2003 Catalunya seems to be the last WRC event with the big clear numbers:
http://rallye-info.com/images/photos...a/petter_3.jpg
Then from 2003 Rally GB it was the small number with the rally name:
https://www.wrcwings.tech/wp-content...03-by-SWRT.jpg
For me the numbering system or whatever number anyone has isn't really important let alone an issue.
4 Lappi
44 Greensmith
#96 Veiby