It looks like the organisations responsible have been changed, with the new IMT, and also that the CCDRs may have their own standards.
Please read:
http://www.imtt.pt/sites/IMTT/Portugues/InfraestruturasRodoviarias/InovacaoNormalizacao/Divulgao%20Tcnica/RevisaoNormaDeTracado.pdf
Here you can find lots of the information about road design in Portugal...
Thanks Luis, thatt's a useful document
The CCDR-N document refers to classifying roads in various terms such as,
The CCDR-N also suggest that the number of classes for an urban road network should depend on the complexity and size of the urban space.
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