Overlay on a divided highway

How do you create an overlay template for a divided highway with a single centerline in Openroads Designer?

  • There are two SIG recordings on the LEARNServer on overlay and milling that may be of interest. Parts 1 and 2 are at the bottom of the list. - Part 2 covers divided highways.

    https://learn.bentley.com/app/Public/ViewLearningPathDetails?lpId=111750



  • So based on this I will need a separate centerline for each side, there isn't a way to use a single centerline? The reason I was hoping to use a single centerline is that my project transitions from a divided 4 lane down to two lanes and I think it would simplify things if I could use a single centerline throughout the project. 

  • You can define multiple "origins" on a template and use other methods to control their offsets and elevations.

    For example, create two PGL points for the two roadways and constrain them vertically to the template origin. Now, they will vertically follow you corridor profile. Next constrain them horizontally to the template origin using the appropriate offset values and assign those values  parametric labels. By default, they will follow the corridor alignment at their defined offset, but to can also transition them using the parametric constraints, if necessary. Or, in the areas where you need to taper them down to zero, create two point control alignments that follow your desired transition geometry and assign them as horizontal point controls within those limits.

    The two PGL points can have the pavement components constrained to them or they can be one of the vertex points in one of the pavement components.

    Also, if a point is offset but unconstrained, it will usually maintain its offset unless acted upon by some other control. But I usually try to constrain all points other than the origin to ensure the points behave as I expect. 


    Charles (Chuck) Rheault
    CADD Manager

    MDOT State Highway Administration

    • MicroStation user since IGDS, InRoads user since TDP.
    • AutoCAD, Land Desktop and Civil 3D, off and on since 1996