Are you using our Pavement Markings module?
I took a look at that module and it looks like it can handle both line and pavement markings. You would just use the Type field to indicate what kind of markings they were.
When linking that to GIS it is important to know that you can link 2+ feature classes to 1 Lucity module. That means that you could have a line feature class for lane markings and a point feature class for arrows and such.
Let me know if that answers you question.