Standard Lane Widths

It is important to make sure that the width of the roadway is large enough to accommodate most types of design vehicles. A width of 12 feet for through lanes is desirable on both rural and urban roadways, although the use of 9 foot to 11 foot wide lanes is not uncommon on low-volume roads (i.e., less than 400 AADT) in rural and residential areas. In addition, auxiliary lane widths should not be any less than 10 feet.