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Traffic reviewers ask consultant to clarify driveway volumes and queuing assumptions for proposed Dunkin'
Summary
City reviewers and the project's traffic consultant debated which figures should show driveway volumes and whether the queue/service time assumptions (40 seconds at the window vs. total ordering/pickup time) are correctly applied; reviewers requested a simplified figure and legend clarifying pass‑by and project trips.
Traffic review dominated much of the DRC discussion as staff and consultants examined how the applicant’s traffic study presented trip generation and queuing for the proposed drive‑thru.
Craig Paragoid, the traffic consultant, said he would add a figure that shows driveway volumes to make the analysis clearer: "I'll put a figure in there that just shows the driveway volumes, and then it'll make it easy," he said. City reviewers pressed that project trips at the driveways must show total volumes (including movements that affect the driveway) and that pass‑by trips should be explained in the legend rather than be left as negative numbers that confuse nontechnical readers.
Reviewers also debated which service time to use for queuing: one participant said industry queue formulas treat the window service time as the controlling point (about 40 seconds), while others argued the total time from ordering to pickup — often 2–3 minutes in busy periods — drives queue backup. An agency reviewer told the team, "Driveways are always shown with the total volumes," and asked the consultant to ensure figure 6 reflects those totals and to add legend text explaining negative/pass‑by entries.
The consultant agreed to simplify and consolidate figures (removing an extra figure the reviewers called unnecessary), add a clear legend, show realistic driveway/access geometry (including U‑turn options where applicable), and email relevant pages from the ITE drive‑through chapter as supporting documentation. Staff said the cleanup items were largely clarifications rather than major design changes.
