The purpose of NOM-037-SCT2-2020 is to establish the general criteria to be considered for the design and placement of protective barriers, including bridge parapets, on roads and urban roads of federal, state and municipal jurisdiction, as well as to establish the designation, definition and use of the various elements that make up said barriers.
NOM-037-SCT2-2020 was published in the DOF on February 18, 20221 and a modification to subsection 5.1.1 was subsequently published. and addition of a transitory article to said NOM, on October 13, 2022. However, the standardizing authority detected that Table 2 of the aforementioned modification requires a couple of clarifications: the first, reference to the indicated containment level 5 in the first column, it is necessary that the vehicle corresponds to articulated trucks with a dry box. And the second, add Note 3 at the bottom of table 2 indicating that "In the containment levels NC-4, NC-5 and NC-6 for the test with the truck or tractor unit, as the case may be, It is preferable, although it is not essential to use a configuration with a cabin behind the engine.