Navigation when "walking" on the highway at 130 km/h
When I'm moving with speeds higher than 20 km/u the app should suggest changing to driving instead of walking. A (optional) button on the navigation screen should fix this: a car-icon when driving, a person-icon when walking etc.
Furthermore the current solution is dangerous. We all know the stories of people turning right when it's impossible because the navigation said so. On the highway this could be really dangerous.