At night, a red light must be attached to the extreme rear of the load and visible for at least ___ feet to the sides and the rear. {Ans: 500}the three braking systems that make up an air brake system are {Ans: service brake, parking brake, and emergency brake}any load except for poles, pilings, and logs may not extend more than ___ beyond the rear of the vehicle {Ans: 8ft}any load may not extend more than ____ in front of the vehicle {Ans: 4ft}the equation which equals the total stopping distance for vehicles with air brakes {Ans: perception distance + reaction distance + brake lag distance + effective braking distance}the part of the air brake system which is operated by turning a quarter turn or by pulling a cable and which must be drained manually at the end of the day {Ans: manual air tank drain}if the air pressure in the tanks falls below ___, the low air pressure warning will come on. {Ans: 60psi}Also, high beam headlights must be dimmed no less than ____ feet from oncoming traffic, and ___ feet of a vehicle being followed. {Ans: 500, 200}high beam headlights