Thanks for the additional context for these names. It sounds like it may be more appropriate to move these to the loc_name tag (https://wiki.openstreetmap.org/wiki/Names#Local_names_(loc_name)) since they are not official. I will also defer to your suggestion about name syntax - Route de Ceinture Ouest and Route de Ceinture Est. I used this layer (https://www.tefenua.data.gov.pf/datasets/08de13d5a8e94dcea4f15bb9c5280877_0/explore) to check for road names but did not see anything attributed in this dataset. If there is a different open resource you use for these types of verifications I would be happy to utilize that. I can make those changes if you agree with this proposal. 