Average size of a road lane?

The average size of a road lane in the United States is 12 feet wide. However, the width of road lanes can vary depending on the type of road and the location. For example, lanes on highways and interstates are typically wider than lanes on local roads. In some cases, lanes may be as narrow as 10 feet wide, while in other cases they can be as wide as 14 feet wide. The average width of a road lane in Europe is 3.5 metres (11.5 feet).