Use a vivid stop sign with a warning to visitors about which way the gate opens.
Size: 12" x 12" Material Type: Engineer Grade Reflective Aluminum Sign Verified Purchase
Size: 18" x 18" Material Type: Engineer Grade Reflective Aluminum Sign, 80 mil Verified Purchase
Size: 12" x 12" Material Type: High Intensity Reflective Aluminum Sign Verified Purchase
Size: 18" x 18" Material Type: High Intensity Grade Reflective Sign, 80 mil Aluminum Verified Purchase
Stop here .... gates open toward vehicle
Sign well made...excellent reflection. Would recommend!