What Is a Height Pole (Hi-Pole)?

A height pole, also known as a high pole or hi-pole, is a specialized measuring device attached to the front of a pilot car. It is essential for measuring overhead obstructions when transporting over-dimensional (tall) shipments by oversize trucking companies. Various North American states and provinces have regulations that dictate when a height pole is required for moving over-height loads. Trucking companies must determine whether their shipment necessitates a height pole before applying for an oversize permit. This ensures compliance with local laws and guarantees safe transportation.

How a Pilot Car with a Height Pole Operates

The image below represents a typical pilot car equipped with a height pole. You’ll notice the measuring device mounted at the front of the vehicle, extending upward to account for any potential overhead obstacles. Height poles are adjustable, typically made from fiberglass, and can be modified to meet the specific height regulations of different states or provinces.

The height pole is set to a height approximately 6 inches (15.24 cm) taller than the shipment once it’s loaded onto the trailer. As the pilot car leads the over-dimensional load, the height pole helps detect any obstructions in the transport route. If the height pole hits something, the pilot car driver hears a distinct sound and immediately alerts the truck driver transporting the load. This early warning system helps prevent damage to both the shipment and any overhead infrastructure.

In the U.S. alone, more than $169 million in damages were caused by overhead obstructions in 2015. Using a properly installed height pole can drastically reduce these risks, ensuring the safety of the shipment, the transportation company, and motorists on the road.

Importance of Correct Height Pole Installation

Proper installation of a height pole is crucial for safety and functionality. It must be directly connected to the frame of the pilot car for two important reasons:

  1. Stability: Ensures the pole remains securely in place during transport.
  2. Audible Alerts: When attached correctly, any contact with an obstruction will produce a loud, distinct noise that alerts the driver.

Mounting the height pole securely to the vehicle frame allows the driver to hear the warning sound more clearly. Using substandard support or improper attachment methods could result in failure to detect obstructions, leading to potential accidents or damage.

Recommended Methods for Installing a Height Pole

There are several methods for attaching a height pole to your pilot car. One of the most effective solutions is using a heavy-duty bumper grill, similar to those found on law enforcement vehicles. Here are a couple of options for installation:

  1. Modifying the Bumper Guard: You can cut the top portion of a bumper guard to create an opening for the height pole. Ensure the pole can be securely locked into place once inserted.
  2. Welding a Pipe: Another option is to weld a small pipe, matching the base of the height pole, to the bumper grill. This requires careful planning and welding to ensure the pipe is perfectly vertical, but it provides a strong, secure attachment point.

The reason a bumper grill is recommended is because it attaches to the vehicle with two bolts and is made from durable tubing. This material matches the heavy-duty requirements of most height poles, allowing for a sturdy and reliable installation.

By following these installation methods, you ensure the height pole is not only properly mounted but also efficiently meets the needs of transporting over-height shipments.

Trucking Pole Escort Height Map

The pole escort height map below is provided as a general reference. Please note that state laws regarding height pole escorts may vary, and these regulations are subject to change. It is essential to always adhere to the most up-to-date state laws. To ensure compliance, we recommend to visit official state websites regularly.

Hight pole map

Understanding Pole Escort Height Requirements

As shown in the map, the height requirement for pole cars varies from state to state, with the most significant differences found in eastern states, particularly the New England region. A state’s pole escort requirements may also depend on the specific route used within that state, including:

  • Highways
  • Non-designated highways
  • City and county regulations

These factors can all influence the need for a height pole escort. Additionally, as the overall height of a shipment increases, states may require more escort vehicles or even route surveys to ensure safe and compliant transport. Always review the specific regulations for each state before planning a shipment.