State Police Drivers Practice Test

Passing a tractor trailer on the left is considered the safest practice for several reasons. The left side of a tractor trailer is typically the side that offers the best visibility and space for safe maneuvering. When you pass on the left, you can see the entire length of the trailer as well as the driver’s side mirrors, which helps you assess whether you have enough space to complete the maneuver safely without cutting off the larger vehicle.

Additionally, tractor trailers have significant blind spots, often called "no zones," around their right side. By passing on the left, you minimize the risk of entering a blind spot where the truck driver may not see you. This is particularly important because large vehicles take longer to stop and have wider turning radii, making it essential for smaller vehicles to ensure they’re visible and clear of the truck's path during a pass.

It's also worth noting that maneuvers such as passing should always be executed with a thorough understanding of road conditions and traffic regulations, and without any undue uncertainty, such as waiting for a signal or worrying about the time of day. Therefore, it is advisable to always pass a tractor trailer on the left for maximum safety and visibility.