Multiple Alternate Surfaces

I would say 'No' if you are strictly refereeing to the Alternate Surface option within a template.  If you assign an alternate surface to a point that is also part of the Top Terrain, then it can be in two different surfaces terrain models.

There is also an ability to create terrain models from elements.  This can be used to assign features from a corridor to multiple terrain models.  These terrain models from elements will follow along as the corridor template is modified.  So, in that way it seems to have the ability for any one point or feature in a corridor to be part of as many Terrain Models as you may need.  Not sure if that helps but it may be useful in some instances.

Hi Mike, I was indeed referring to the Alternate Surface option within the template. I am familiar with the more conventional methods of creating different surfaces but was wanting to play around with optimising that within the template. Example to create 2 alternate surfaces where one is for top of pavement only (for aquaplaning checks) and the other a complete design surface. Seems like using graphical filters or terrain from elements remains the preferred method.

Use an end condition instead of that project to surface constraint.  You can then use target alias to seek multiple surfaces. 

Use an end condition instead of that project to surface constraint.  You can then use target alias to seek multiple surfaces.