Regarding the dimensions of the gooseneck section of a trailer, the national and international standards are as follows:
- ISO 668:2020: This is an international standard published by the International Organization for Standardization (ISO) on the classification, dimensions and grades of Series 1 freight containers. In this standard, the dimensional requirements of gooseneck tunnels are described in detail.
- ISO 1726-2:2007: This is another ISO standard that describes in detail the profile and dimensions of the gooseneck section of a semitrailer. According to this standard, the gooseneck is located on an outer surface consisting of different planes and a rotating surface, which are connected in sequence without forming steps. The specific dimensions are as follows:
- The length of the first plane (AB) L1 = 500 mm.
- The combined length of the first and second planes (L2) = 1350 mm.
- The length of the fourth plane (AU) L3 = 1800 mm.
- The radius of the arc between the third plane and the vertical part (r2) = 450 mm.
- Radius between the coupling pin (kingpin) axis and the vertical part (r3) = 2100 mm.
- Angle between the second plane and the first plane (γ1) = 1°.
- Angle between the third plane and the first plane (γ2) = 7°.
- Angle between the inclined plane and the horizontal plane (α) = 3.5°.
- US and Canadian regulations: In the United States and Canada, the maximum permitted width of trailers is generally 8.5 feet (about 256 cm). This means that in order to be legal on the road without the need for special permits, the trailer width should not exceed this size.
These standards and regulations ensure compatibility and safety when designing trailers, and also provide clear sizing guidelines for manufacturers and users. Compliance with these standards is essential to ensure that trailers can be operated legally and safely on the road.
