19. All the tests are carried out in the following conditions:
(1) they take place on a straight bitumen or concrete roadway that is dry, clean and without oil or grease;
(2) the vehicle weighs its gross vehicle weight rating;
(3) the tires are inflated at the pressure determined by the manufacturer.
In the following provisions relating to those tests, the letter “V” refers to the maximum speed of the vehicle in kilometres per hour. The calculation is made without taking into account units of measure and the result obtained corresponds to a braking distance in metres.