BALTIMORE (AP) — Maryland state transportation officials are warning drivers to expect delays in Baltimore as the Grand Prix of Baltimore gets under way this weekend.

The Grand Prix, now in its second year, runs through Sunday.

Significant road closures began Thursday evening. The northbound Martin Luther King Jr. Boulevard exit to Russell Street is closed. And Light Street between Key Highway and Pratt Street, and Howard Street between Lombard and Pratt streets are closed.

The Charm City Circulator bus also relocated all Orange Route stops from Pratt Street to Baltimore Street.