Transporting Oversized Load

In the United States an oversize load is a vehicle and/or load that is wider than 8' 6". Each individual state has different requirements regarding height and length (most states are 13' 6" tall), and a driver must purchase a permit for each state he/she will be traveling through. In many states, a load must be considered "nondivisible" to qualify for a permit (e.g., an object which cannot be broken down into smaller pieces), although some states allow divisible loads to be granted permits.
Typically, the edges of any oversize load must be marked to make them visible to drivers. during daytime the required marking is usually red flags, and during night white or yellow lights may be used. The hauling vehicle must have at least one flashing amber light in the front and back. Signs (yellow with black border in the United States, red and white diagonal stripes in the EU, and red and white vertical stripes in Canada), saying "Oversize load" must be put in the front and back of the vehicle.
A pilot and trailing cars are required also. They must have at least one flashing amber light on them. Their purpose is to warn drivers about what's approaching. The pilot car warns drivers in the opposite lane to move away, and the trailing car warns any candidates to overtake. The driver of the pilot car must have a voice link with the driver of the truck to warn him or her about any low bridges, wires, obstacles, etc. The driver of the trailing car is responsible for the safety while passing obstacles or overtaking slower vehicles.