I think it was that same article that inspired me to write an iOS app that displays your running average speed and notifies you if you deviate from it. It's be

I think it was that same article that inspired me to write an iOS app that displays your running average speed and notifies you if you deviate from it. It's been years since I've last built and run that app, but the source is here if anyone wants to take a look: https://github.com/robinmj/DeTrafficator https://github.com/robinmj/DeTrafficator