The Boston area had the worst rush-hour traffic in America in 2018, according to a new report from traffic analytics firm INRIX.

Drivers here spent 164 extra hours every year on the road during rush hour last year that they would not otherwise have had to spend if traffic was free-flowing, the report said. That number has gone down by 10 percent since 2017, but Boston drivers still lose more hours in traffic than Washington, D.C.-area drivers, who lost 155 hours in traffic last year. The average speed in downtown Boston was 11 miles per hour, the report stated.

INRIX estimates the congestion cost the Boston economy $2,291 per driver, or $4.1 billion for the entire area’s economy, based on federal Department of Transportation standards for time loss. That is lower than New York City, which came in fourth, with 133 hours lost in rush-hour traffic costing the city’s economy $9.5 billion.

“While this report provides a snapshot of the economic costs of congestion in cities, it does not reflect the impact of the time loss for individuals of different incomes. Boston may incur the most significant costs in dollar terms, but a robust public transit system means alternatives exist for lower-income households. In contrast, in a city like Houston (up to $1,365), many households depend on driving, which is more expensive on a per mile basis,” the report noted.

Among the nation’s most congested roads, New York’s Cross-Bronx Expressway between Throgs Neck and Manhattan took the top spot, while Massachusetts’ Southeast Expressway between the Mass. Ave. Connector and the Braintree split took seventh place, after Interstate 76 in Philadelphia, but ahead of New York’s Brooklyn-Queens Expressway between the Long Island Expressway and the Manhattan Bridge.