Agreed, this is extremely confusing and a pretty big design flaw. Google Maps pops up a warning if the business you are traveling to is closing soon, or if ther

Agreed, this is extremely confusing and a pretty big design flaw. Google Maps pops up a warning if the business you are traveling to is closing soon, or if there are tolls. It should show a warning in these situations where the road ends far from the destination. The heuristics are less obvious, but I think you could catch most cases. You could even prompt to add another section to the trip in walking mode.