Thank you for the question, Mr. Chair.
I have two comments. Treasury Board is a bit of a unique animal. The bulk of Treasury Board's lapse here is in what's called “central votes”, and they are very much continency funds, so they're only called upon if needed. They're not programs.
With regard to the other five departments here—and you've highlighted infrastructure—these are our most frequent lapsers, and it's because of the nature of the business they're actually in.
With regard to infrastructure, most often you're negotiating agreements with either provinces or municipalities, sometimes both. Because of the way the vote structure works—you have the up-to amounts—departments have to come in with their most optimistic view of the world, and reality never works out quite as fast as their optimistic view of the world, so these five departments, based on my recollection, are the same five that would be on top of the list every year.
For DND, it's because of large procurements. The others here are usually involved with negotiations either with provinces or with first nations organizations, and it's those negotiations that typically cause delays.
I think the unique thing on infrastructure this year is that the Windsor-Detroit bridge falls under that ministry, and that's a major project that had some lapses.