iSpeedAlarm app for iPhone and iPad
Caution: This app uses GPS in background, so it affects battery life.
Save your money from fine. :)
This app rings alarm when you exceed speed you set.
So, this app helps you not to exceed speed.
In the US, the app recognize whether you are in high way or not.
There are two modes (day mode, night mode)
You can see the statistics about your driving records.
Safe driving. :)