Is a semi-trailer 13.75 meters long and 3 meters wide legal?

The limit of vehicle exterior dimension is a problem that car owners pay more attention to. If the size exceeds the scope allowed by regulations, not only the driving difficulty and driving danger are greatly increased, but also it is likely to lead to fines or points, affecting daily operations.

Semi-trailer as a cargo transport vehicle, the size of its load is directly related to the cost of freight, some owners want to buy some legal size parameters are relatively large models, such as 13.75 meters long, 3 meters wide semi-trailer.

This semi-trailer is commonly known as "big plate car", the scientific name is "low plate semi-trailer". Previously, the length, width and height limits for this type of vehicle were 13.75 meters, 3 meters and 4 meters, respectively.

In March 2020, the Ministry of Transport issued an announcement to redefine the technical specifications for low plate semi-trailers, stipulating that the maximum profile size of low plate semi-trailers can be: 13.75 meters long, 3.4 meters wide and 4 meters high. That is to say, the width limit has been raised.

In addition, in the current environment of tightening the investigation and punishment of illegal modifications, regulations seem to open a "green channel" for low plate semi-trailers.

According to the JT/T 1284-2020 technical specification for low plate semi-trailers, in addition to low plate semi-trailers, three models of "low plate enhanced semi-trailer", "three-axis low plate enhanced semi-trailer" and "variable five-axis low plate enhanced semi-trailer" are also defined.

Therefore, the semi-trailer, which is 13.75 meters long and 3 meters wide, is legal. However, the car mainly pays attention to two major premises:

1, gooseneck legal, equal width is not legal.

The concave beam frame is generally used in the structure of the low plate semi-trailer, that is, the front section is gooseneck, the middle section is the cargo platform, the rear section is the wheel frame, and there is no fence plate around.

Some owners do not think that the front gooseneck affects the loading capacity, will require modification to the front and rear equal width of the cargo platform, trailer factory in order to cater to users, will also launch some modified models.

Note that if the vehicle is a low plate semi-trailer, trailer axles or the size of the vehicle has reached 13.75 meters long and 3 meters wide, it must use a gooseneck structure, and the equal width structure is illegal.

2, loading general goods is not legal.

Low plate semi-trailer belongs to a special model, is the transport of non-removable large goods, "low plate enhanced semi-trailer", "three-axis low plate enhanced semi-trailer", "variable five-axis low plate enhanced semi-trailer" is also used for the transport of large goods, which is expressly stipulated.

Before some large car owners to the vehicle to hang "over the limit temporary plate" engaged in general cargo transport, for this behavior the Ministry of Transport also gave a clear reply: suspension of temporary driving plate over the limit special vehicles, should be used exclusively for the transport of non-disintegrable items, should first handle the "over the limit transport vehicle pass" before passing the highway.

In other words, although there is still a situation in the market with large plate trucks loaded with general goods, once the relevant departments invest in governance, I am afraid that many low plate semi-trailers will be idle, and the impact on the owner is also very large. It is suggested that all owners should take a long-term view and follow the laws of industry development.