Google has slowly changed how it displays driving directions to limit routes to ones it thinks burn less fuel. When plugging in the drive to get to my parents it presents one option that uses a ferry. The directions treat the ferry like a bridge that you could use at any time, and it no longer presents alternate routes that use actual roads.
The ferry runs twice a day.

@Apiary Last summer I was in London, and a friend was driving some place North West of the city. Google Maps was constantly changing the route to avoid “traffic jams,” making us leave the main street, take a side road, then come back, rinse and repeat.

Those were not traffic jams, they were regular, non jammed traffic lights. Google Maps was diverting us to the side of the intersection that was currently green. Of course, by the time we reached it, it was red, and our original street was green.

@oscherler @Apiary I recall someone actually took the time to compare Google Maps, Apple Maps, and Waze. IIRC Waze was the most optimistic, Google the most aggressive about trying to avoid traffic, and Apple gave the most precise estimates.
@oscherler this is one of the main reasons why I still use a human navigator. Turn by turn directions sometimes forget all sorts of practical info.