That's wild. For giggles I read the CA Engagement Record and Reference Form. It doesn't specifically exclude those items. What it does state is:
1. "qualifying experience includes only engineering work"
2. "qualifying experience may be less than the total number of months worked"
3. "qualifying experience means engineering employment that requires the applicant to use sound judgement (sp) in making engineering decisions and contributes to progress towards becoming a Professional Engineer"
what i'm gathering about their setup is they aren't married to the typical 4 years experience as they are "four (4) professional work references demonstrating a sufficient number of months of qualifying engineering experience"
now, IMO, striping/signing plans SHOULD count. even though you probably use the MUTCD or state manuals as guides, they all employ a certain amount of engineering judgment. not all situations call for using all the signs, specific scenarios may require additional signing, alternate spacing, etc. THAT would be engineering work. if by striping/signing plans you simply are just detailing what someone else specified, then that's not engineering, that's drafting.
additionally, it calls back to what I posted earlier about progressive experience. they state that each "engagement" can't be the different projects with the same employer but only in the same capacity. warrant and speed studies, collision analysis, and project coordination I can see not counting, as that does not employ engineering design, but rather just use data/formulas already determined. in KY we consider that "civil tech" or "civil designer" work. project management ... that may depend.
the big difference here is our employers who may start us off doing construction cost estimates, studies, etc. do consider that "experience" since it exposes the new engineer to different aspects of the projects and we learn more about the design from working with the design engineers. the next step in the progressive part is becoming the person who will use that data to make decisions with it. so over the course of a 4 calendar years we can show we progressed as engineers.
California seems to be more focused on specific "engagements" that show true engineering work that shows progressive learning as an engineer that totals for "sufficient number of months" and several of the things that are more "tech work" are just the gaps in between.
perhaps you can provide more details to explain how "engineering judgment" was being employed in the areas that are being rejected. as a project manager, I may do little or no actual design work on a project, but I use my engineering judgment to generate the initial concepts and determine initial layouts, survey scopes, assign the work, assess what the designer has put together, and then I markup areas that need improving, I communicate with the client to explain options and impacts, and see that the work is carried out. if that's the project management you're referring to, I think you can make a case for that counting. if the project management you're referring to is the vague, generalized form that so many put on their resumes meaning they helped put all the pieces together, then that's really just project coordination or collaboration.
good luck, hope you're able to make it all work out.