Roadway profiles should be designed using vertical curves at vertical points of intersection and intersecting streets where practical. Designing a sag or crest vertical point of intersection without a vertical curve is generally acceptable where the grade difference (A) is:

When a grade change without vertical curve is specified, the construction process typically results in a short vertical curve being built (i.e., the actual point of intersection is “smoothed” in the field). It is recommended to always use vertical curves to address grade changes for the following conditions.

The minor approach (the approach with the lower ADT) of an intersection with yield or stop control may be constructed without vertical curves, provided that a grade change does not adversely affect local vehicle operations. A review of local traffic characteristics should be performed to identify a target design vehicle for each intersection for determining an appropriate grade change without a vertical curve. Typically, a grade change of 3 percent or less accommodates most vehicles. However, in highly constrained conditions, a grade change of up to 8 percent may operate effectively depending on local site conditions.