The case of a 3-arm interchange is not covered in the article's section. A special constuction can be found at the I-10 / I-20 in west Texas, also applied at some interchange constructions in Florida. This example shows how costs of flyover ramps and bridges are increased, compared to a simple at-grade ramp/road.
Counseling and therapy are generally two synonymous terms as they can be interchanged. A therapist can provide counseling and psychotherapy. However, a person who counsels called a counselor will depend on the degree he or she has received. Therapy involves a more difficult task to do compared to counseling. So the people conducting that can be psychiatrists, psychologists, or social workers.
But even here there is no consistency. For instance, the term counselor is most often used by Master's level practitioners. But in any listing of therapists you could find a doctorate level counselor, or a Master's level psychologist. could see a neurofeedback therapist or a behaviour therapist. One could have a B.A. in psychology with a certificate course, and the other a doctorate in psychology registered with a Board of Examiners. Only the letters after the name define which therapist is more qualified.