Continuing following some of my ancestors travel routes, as you leave Farmersville...the place of my Dad's birth, head out hwy 380 East toward Greenville to do this P&G in safety.
There is a parking area just past the guardrail for your safe parking, be cautious backing out.
Dad always told us he babysat Audie Murphy from time to time so a cache in Dad's honor on the Audie Murphy Memorial Highway is appropriate.
Be safe.