Marylebone Road (/ˈmɑːrlɪbən/ MAR-li-bən) is an important thoroughfare in central London, within the City of Westminster. It runs east-west from the Euston Road at Regent's Park to the A40 Westway at Paddington. The road which runs in 3 lanes in both directions, is part of the London Inner Ring Road and as such forms part of the boundary of the zone within which the London congestion charge applies.