Specialized set it up that way. Do a search on the web for specialized tricross singlecross. They come with v brakes, cross interupter levers and roadbrakes. Sheldon explains that v brakes can work with road brakes, if you have the right ones
http://www.sheldonbrown.com/canti-direct.html. Anyway it is not the brakes or the road brakes that are a problem, they work well.
My problem is I cannot think how to adjust the cross interupter levers without harming the setup of the road brakes. Are there any specialized tricross singlecross users out there?
thanks