In the U.S., the standard width for a semi-trailer is 8.5 feet ... In addition to the documents semi-truck drivers must have, extra-wide haulers require a special permit and may sometimes ...

The length and width of the skirts help reduce the aerodynamic drag caused by air turbulence when the truck is moving. Read more: The 15 Most Reliable Pickup Trucks Of All Time, Ranked For semi ...

The length and width of the skirts help reduce the aerodynamic drag caused by air turbulence when the truck is moving. For semi-truck drivers and owners, understanding how aerodynamics affects ...