PDF alert, almost every link will lead to a PDF

Amsterdam's Red Book (Handboek Rood), with design standards for street design, and Green Book (Handboek Groen), with standards for street vegetation (only in Dutch):
https://openresearch.amsterdam/nl/page/108424/puccini-methode-handboeken-rood-i-en-ii-en-handboek-groen

Oslo also made their manual available, look for the file "Street-design-manual_ENG" for the english version:
https://www.oslo.kommune.no/gate-transport-og-parkering/veiarbeid-og-vedlikehold/gatenormal-og-normark/

Copenhagen also has it in great details here (Some in Eng, others in Danish):
https://urbandevelopmentcph.kk.dk/mobility-cycling/copenhagen-the-best-cycling-city-in-the-world

Highlights to:
Good, better, best. The city of Copenhagen’s bicycle strategy 2011-2025
https://kk.sites.itera.dk/apps/kk_pub2/index.asp?mode=detalje&id=823

Cycle-Friendly Infrastructure 2024 - Design standards for cycle and road projects in the City of Copenhagen
https://kk.sites.itera.dk/apps/kk_pub2/index.asp?mode=detalje&id=2947