This UX Utility works independently of whatever skin you have. Some skins have this facility built in so not required for them but if you have a basic skin and want extra options then this feature is for you.
This add-on will allow your unit to display and vocally tell you that speed limit has increased.
In Settings / Sound and Warnings / TTS Pro you can set the "Correction speed unit" (only use if TTS voice mispronounces selected speed units (kilometers per hour, miles per hour)) - It may also be necessary to add or check in the content \ voice \ Voice_TTS \ i18n \ dictionary.voice voice file for the following text below, if missing then add:
In the Sounds and Warnings section you will get an option to activate or disable the feature.