(a) Traffic patterns used for vehicle travel within railroad ramping and deramping yards shall be well-defined and the direction of traffic clearly indicated or controlled as necessary by one or more of the following methods as appropriate under the circumstances: a supervised program of traffic control, written and published (posted) administrative directives, signs, markers, site maps, etc.

(b) During switching operations in the ramping and deramping yard, signal devices, such as those listed in (1), (2), and (3) below, shall provide visual warning of the approach of railroad equipment. These signals shall be readily visible to persons working on or around railroad cars in the area of hazards created by train movement, to pedestrians, and to vehicle operators at track crossings.