Mr. Speaker, I thank my colleague for his question. Although I am an engineer, we cannot go into this too much today. The word "vibration" was added to the question of noise primarily at the request of citizens' groups who complained about vibration in some cases, and not just about noise.
We had ultimately concluded that most of the time there are two interconnected phenomena: when there was noise, there was also vibration, in some cases. Obviously, the vibration will be felt more, the closer the houses are to the railway. However, the type of soil itself also has to be examined for each location, because some qualities of soil transmit more vibration than others.
When you are very close to rock, obviously you feel less vibration. It depends on the subfoundation. Depending on whether the soil is clay or sandy, and depending on the depth of that layer of soil, it can produce more vibrations, according to the distance of course. There again, in terms of the soil, if any attention is paid to this issue in a bill, I think that those calculations will have to be done so that it can be determined, for each location, how far away the houses must be located from the railway, and vice versa, to avoid the vibrations being felt in the homes.