Google maps shows some back roads as being slightly shorter in distance, yet longer in travel time. Back when I was commuting a lot by motorcycle, I explored those back roads and found that not only are they way more scenic and shorter in distance, but faster travel time too. Perhaps Google thinks I slow down for turns. At any rate, the back route is faster even if I'm driving my truck with a trailer.
When ETAs are fairly close, I always choose the shorter route. They tend to be more scenic, less busy, and don't end up taking more time.
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