An academic study released last week showed that transportation network companies (TNCs) such as Uber and Lyft are taking a bite out of parking demand, at least in Denver, Colo.

The study found that TNCs contribute to congestion on city streets. Users elected for ride-hail instead of public transportation for one thing, and usually rode alone, effectively turning the ride services into single-occupancy vehicles. Many users reported opting for ride-share so they wouldn’t have to find parking at their destinations, but the study found parking would have been relatively simple to find had they driven.

The study concluded that cities may not need as much parking near restaurants, bars, airports, stadiums, and event venues due to TNCs’ popularity. Read the whole story here, or download the study results here.