What if an on-street parking shortage boiled down to drivers parking badly? That’s the result of a study in the U.K. that found drivers parking so badly that nearly one-fifth of available parking goes to waste. And there’s more—the study also found that if drivers used park-assist technology rather than parking themselves, up to 17 percent of parking space could be freed up, just like that.

Researchers asked drivers about their parking, too. Forty-seven percent said parking by other drivers was a major frustration and 38 percent said they’d deliberately left space next to their vehicles so no one else would park next to them.

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