On my review team, I have a traffic engineer. He claims he has no authority on the team because all of his "regulations" are recommendations and best practicies. Because of this, he feels afraid to recommend parking layouts, circulation changes, or even, minimum drive aisle widths. I want him to feel as if his comments on traffic are as important as mine with zoning. I gave him a traffic study for a new 150,000 square ft retail center and he said, "What am I supposed to do with this?" He went on to say, even if I think the study will cause extra impact on our streets, I can't do anything about that.
Short of making changes to the zoning code and city code, what can I do to inspire him and show I'll support his comments?