Interchange - Model Slopes at Bridges?

Greetings-

I am running InRoads 8.09.03.06 with MicroStation 8.09.04.88. 

I am currently modeling an interchange.  I think I feel comfortable enough with the basics, but one task that has come to mind is when I get to bridges.  My roadway will need to stop, and my dirt slope down to a catch point on my existing surface under the new bridge.  Thing is, the feature representing the slope cath point will be perpendicular to my roadway centerline. 

Is it possible to build this slope into my model using Roadway Designer?  If so, what might anyone suggest as a "best workflow" for accomplishing something like this?  The real trick will be having one corridor that begins, proceeds along on fill up to the start of a bridge, the dirt tapers off, as the bridge starts, then one gets far enough to where the bridge will end, the dirt tapers up, and the bridge ends and the ramp continues on fill. 

Also, is it possible to build the bridge slopes and represent the bridge using components, without the need for a seperate surface?  I know I can represent the bridge components in a seperate corridor and surface, if needed. 

If push comes to shove, I can add the features for the bridge slopes in manually (i.e. wireframe) after Roadway Designer is done.  But RD is a powerful enough tool that I am thinking I may not need to do that. 

Any input is appreciated!