I think you've confused the HUD and the navigation screen. The HUD does NOT display speed limits. The navigation screen does display speed limits (page 3-5 in the 2015 Multimedia Users manual). If you go to kiaowners.com and create an account, there is a link where you can download any Kia owners manual. Then you can use ctrl +F to search. Makes it much easier than trying to thumb through the paper manuals!