InRoads data is extremely sensitive to the presence of special characters, like @ and &, and InRoads performs incorrectly when display names exceed 28 characters.
When a special character is encountered, strange, incorrect and puzzling behavior occurs. Special characters can take a long time to locate - so just don't use them! Use only A-Z, a-z, 0-9, and underscore in fields that call for a NAME. Do not use decimal points or spaces in NAME fields.
When naming corridors, templates, surfaces, geometry projects or alignments use less than 28 characters.
When defining your corridors, use a PI Rounding Tangent value that is small - less than 1.0, is probably best. The pseudo curve that replaces the PIs (when there is no horizontal curve defined) will use a total curve length of twice the PI Rounding Tangent value. If the value is greater than the distance between your PIs, you will introduce overlap. If one pseudo curve overlaps the next, you are likely to have strange things happen, such as, the active surface line will be mirrored in the cross section view of the Roadway Designer in the area of overlap.