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 high-speed, free-flowing roadways. The use of 9 foot to 11 foot wide lanes should be considered to reduce operating speeds and meet traffic calming objectives. In addition, auxiliary lane widths should not be any less than 10 feet.