Large objects are classified into four levels based on their external dimensions and weight (including packaging and support frames):

（1） First level large objects refer to those that meet one of the following standards:

1. Length greater than 14 meters (including 14 meters) and less than 20 meters;
2. Width greater than 3.5 meters (including 3.5 meters) and less than 4.5 meters;
3. Height greater than 3 meters (including 3 meters) and less than 3.8 meters;
4. Weight greater than 20 tons (including 20 tons) but less than 100 tons.

（2） Secondary large objects refer to those that meet one of the following standards:

1. Length greater than 20 meters (including 20 meters) and less than 30 meters;
2. Width greater than 4.5 meters (including 4.5 meters) and less than 5.5 meters;
3. Height greater than 3.8 meters (including 3.8 meters) and less than 4.4 meters;
4. Weight greater than 100 tons (including 100 tons) but less than 200 tons.

（3） Grade III large objects refer to those that meet one of the following standards:

1. Length greater than 30 meters (including 30 meters) but less than 40 meters;
2. Width greater than 5.5 meters (including 5.5 meters) and less than 6 meters;
3. Height greater than 4.4 meters (including 4.4 meters) and less than 5 meters;
4. Weight greater than 200 tons (including 200 tons) but less than 300 tons.

（4） Level 4 large objects refer to those that meet one of the following standards:

1. Length of 40 meters or more;
2. Width of 6 meters or more;
3. Height of 5 meters or more;
4. Weight of 300 tons or more.

The level of large objects is determined by the highest level among their length, width, height, and weight.