Unfortunately, I have first-hand experience with this. The state decided to build a (very) small bridge over a creek in my neighborhood. The purpose of the bridge was to make it easier to get to the highway. None of the residents wanted this bridge, but it was built any way. After the bridge was built, Google Maps started routing people off the highway during rush hour, creating gridlock and heavy traffic. As a result, you can't leave your house between 7-10 and 4-6. Walking on the streets is dangerous as drivers stuck in gridlock become increasingly aggressive towards pedestrians. And don't even think about trying to drive somewhere. It takes 30-45 minutes just to drive a few blocks.
The irony is that this "shortcut" doesn't save any time. Google Maps routes people from the highway into town up until traffic is so bad in town that it... takes just as much time as the highway. So the beauty of this small town was destroyed for literally no reason. Property values have begun to decline as it is no longer a desirable place to live.
Of course, prior to building the bridge, the state ran "traffic studies" that indicated there would be no impact to traffic in town. They had no incentive to really study the problem, however, as there are no consequences for them if they do a bad job.