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Traffic expert outlines three safety measures intended to reduce left‑turn risk at 1‑Mile Corner
Summary
The applicant’s traffic engineer said field sketches and measurements show sufficient passing room near the proposed driveway and proposed three targeted improvements — a speed‑feedback sign, clarified pavement markings for the lane drop/merge, and revised edge‑line/cross‑hatch striping — which TRC and the city engineer reviewed positively.
Todd Brayton, the traffic engineer retained by the applicant, testified that his sketches and on‑site observations show the proposed driveway is more than 200 feet from the 1‑Mile Corner intersection, allowing adequate time and space for vehicles to choose to pass a stopped car turning left into the site. Brayton supplied an estimate of turning volumes (approximately one in AM peak, four in PM peak, and two in a Saturday peak) and said the typical delay to make the left turn is less than 10 seconds.
To address neighborhood safety concerns Brayton proposed three measures he said would reduce risk: (1) a posted speed‑limit sign with a speed‑feedback display just past 1‑Mile Corner, (2) enhanced pavement markings and signage to clearly delineate the lane drop/merge, and (3) shifting the edge line and removing some cross‑hatched markings to provide increased space and visual cues for passing vehicles. Brayton said the city engineer had reviewed the sketches and that TRC’s memo reflected no opposition to the proposed mitigations. The Board conditioned final approvals on continued coordination with the city engineer and the TRC recommendations.
