If I may, one thing we're seeing with the current technologies.... For instance, take diesel engines, for the moment we have new regulations that come up every three years and we deal with North America on the bus side because of the limited volume of buses. One thing that you have to realize is that the whole market for buses is about 6,000 buses a year. That's all of North America for transit buses. When you compare that to the automotive industry, one plant will produce hundreds of thousands of units, so it's really not the same order of magnitude. For us to certify an engine for only that bus becomes prohibitive, so what happens is that we have to deal with one single manufacturer in North America that provides us with an engine. We don't have a choice. That's the only one.
For instance, in the Volvo group there's a whole bunch of different engines that we could be using that have different certifications, like your certifications, and we can't even bring those into Canada and use them on our products. A bus manufacturer is more of an integrator of systems.