hello, could you work with Pavement Drive Assist Continued by azaghal to implement the sign road to your tab please ?

What do you want me to implement exactly?
If those items were in vanilla transport subgroup, they should appear in the Transport group tab automatically, without the need of further coding.

sign road are not a vehicule, just sign that why it's need your attention

Which item group does it belong to?
Was it under either "transport" or "train-transport" subgroups, if not having this mod?

Some items like rail signals are also not vehicles, but they are under one of the above stated subgroups, so are automatically moved to the transport group tab.
If not under either subgroup, that means their author(s) must have good reasons why having their own arrangements. Then it is non-trivial for a non-player (like me) to modify them.
This is EXACTLY why I do not want to get into fine tuning an individual item from others' mod. I do not have enough play time with those mods to know how to do it properly.
If I play a mod sufficiently and know enough of it, I will do that. Sadly, this is not one of those.

ok