I'm kind of anxious about checking the map when I'm riding a motorcycle in traffic. You can get away with much lower situational awareness in a car simply because you're far more predictable and not invisible.
Speaking of which... I'm still waiting for a bike helmet with a back-facing camera/HUD that is neither vaporware nor "smart" (read vendor-dependent and barely working), and doesn't suffer from basic usability mistakes. That would be infinitely more useful and probably easier to make than this.
If road conditions become intense, then passengers will notice, and stop talking to let the driver focus. People on the other end of a speaker phone can't see the road, so will continue blabbing. (Or even try to regain the driver's attention. "Why aren't you responding?") I'm not sure if podcasts are as distracting as someone on a speaker phone, but they similarly don't adapt to the road conditions.
Speaking of which... I'm still waiting for a bike helmet with a back-facing camera/HUD that is neither vaporware nor "smart" (read vendor-dependent and barely working), and doesn't suffer from basic usability mistakes. That would be infinitely more useful and probably easier to make than this.