Ride-hailing services, like Uber and Lyft, are lauded by some for their ability to decrease traffic congestion. Yet, others claim that ride-hailing services increase traffic congestion. A recent study by researchers at Penn State and Boston University analyzed traffic data from across California and found that whether ride-hailing services increase or decrease traffic congestion depends on a variety of factors, including the day of the week and whether the region previously had high public-transportation use.
