How about I, as a developer, "consider your safety" by only releasing my app in European markets where bicycling is more popular than car-travel?
I'm also pretty sure they drive cars in Europe. How does your suggestion aid someone in Germany that just got clipped from someone pulling over unexpectedly?
Also, your suggestion brings up a thought: I'm sure that driver laws differ from country to country in Europe. You're going to need to build some sort of UI/UX that complies with those laws if you want the app to be used freely while driving.
Having the app switch off when the GPS calculates you are traveling faster than 30kmh would be an interesting hack.
The Japanese carrier docomo have an Android app to stop you from using your smartphone while walking, the latest menace to public safety.
https://www.nttdocomo.co.jp/info/news_release/2013/12/03_00....