Subway limiting how many vegetables you put on at some locations?

I was at a Subway I rarely go to and was going through the process of making my sub. I have never asked a third time for more of a certain vegetable but had to this time because the amount was still a bit skimpy. So I asked and the employee said they have to follow a guideline (Or whatever the term she used was) of how much they can put on. That was the first time I heard of that and the other Subways I go to have never said anything about how that before. So has anyone encountered or heard of this before? Is this a option that the branch owner has to either use or not use at their store? Is this a newer thing and will spread to most Subways? I like to have a good amount of vegetables on my sub and If they start limiting that I think a percentage of people won't like It and may not go there as often. Just wondering about this.