Not assuming it would be the same, but picturing a spill at a gas station. Spilling gas is a problem, but at least it's just sort of there. If you get an ammonia leak and it forms a vapor cloud, I don't think most people would know how to deal with that. I'll bet your spilled gas likely won't migrate into the intersection.

But on the plus side, we already see what handling/transportation of large amounts looks like for agriculture, even if rail carriers etc. dislike dealing with it.