Battery hog This app uses a ton of battery, HTC M8. one star is generous. Uninstalling ..
Needs more work Does block the phone completely when driving and responds almost instantly. that's the good part, but the app has lot's of flaws. Even a kid can disable the app, even when password protect is activated. And once phone is blocked and gps signal is lost, the only way to get access to the phone is to restart. it's a shame, because it is the only app I have found that really blocks your phone when driving.
Test you road and traffic signs knowledge and prepare yourself for driving test.