This app is a ripoff. It states there are in app purchases, which are safety credits. It does not state what safety credits are for, these are required for the app work. So in the end you get to pay for the app and then pay to use the app repeatedly.
While I was using the app, about a 3rd of the time it did not know what the speed limit was or where I was. A big waste of money.
Big Scarey about Speed Limits with LiveLink