Doesn't sound too bad, my only uncertainty is with the fact that do we necessarily need this info about speed bumps?

Perhaps this app could collect information about zones where you'd need to slow down, for e.g. around schools and playgrounds. Naturally this is where speed bumps usually are. This way it would IMO "do a bit more" than just tell you to watch out for your car. Hitting a "slow down - children" zone would then alarm you to being generally more observant as well.