N.D. Cent. Code § 24-09-09: Warning devices must be approved by department of transportation

The department, so far as practicable, shall secure uniformity in the devices used to protect grade crossings. No such devices may be installed until the same have been approved by the department. Except for devices prescribed under section 24-09-08, all devices installed, which conflict with the devices approved by the department, either in their design or method of operation, so as to create a hazardous condition to travel at such crossing, must be modified immediately by the railway company controlling the same so as to conform to those approved by the department.