Could be really good

The UI is great but the speedometer readout is too sporadic to be useful. I know the speedometer is my car is displaying faster than Im actually going. I wanted to use this app to find out how much. I get on the highway and set cruise control to 70 mph. This app displays speeds ranging from 61 to 69 mph, all in less than 10 secs. Now I know cruise control doesnt hold your car perfectly on pace at all times, but my speed certainly isnt as erratic as this app is displaying. Once they "smooth" out the erratic speed output, this will be a good app.

Shock J about Speedometer s54 Free (Speed Limit Alert System)