New Jersey Statutes Title 39. Motor Vehicles and Traffic Regulation 39 § 4-128.5

a. Signal lamps mounted at the same level and as high and as widely spaced laterally as practicable. These lamps shall be 5 to 7 inches in diameter and shall display two alternately flashing red lights visible at 500 feet to the front and rear in normal sunlight upon a straight level highway.

b. A stop signal arm that can be extended horizontally from the left side of the truck. When such arm is extended, the side of the stop signal arm nearest the truck shall be 7 1/4 inches long and parallel to the side of the truck. The side furthest from the truck shall be 18 inches long and parallel to the side nearest the truck. The two sides shall be 18 inches apart creating a symmetrical, trapezoidal shape. Two alternately flashing red lights shall be located in the outside corners of the extended signal arm and such corners shall be rounded to conform with the shape of the lights. Each red light shall be 3 to 5 inches in diameter and visible at 300 feet to the front and rear in normal sunlight upon a straight and level street. Both sides of the signal arm shall have a red reflectorized background and the following legend: The word “STOP” shall appear in 6-inch high, 1 inch wide white letters in the middle of the signal arm; above the word “STOP,” the phrase “IF SAFE” shall appear in 2 inch high, one-quarter inch wide white letters; below the word “STOP,” the phrase “THEN GO” shall appear in 2 inch high, one-quarter inch wide white letters. All colors shall meet specifications in the most recently published Federal Highway Administration Standard Color Charts. The bottom of the extended signal arm shall be 42 inches above the street.

c. A convex mirror mounted on the front so the driver in his normal seating position can see the area in front of the truck obscured by the hood.