. However, those trucks and truck-tractors must be capable of complying with the performance requirements of NRS 484.595. (d) Special mobile equipment. (e) Any vehicle with three wheels in contact with the ground, two of which are equipped with brakes if the vehicle is capable of complying with the performance requirements of NRS 484.595. 5. Every trailer, semitrailer, house trailer and pole trailer equipped with air- or vacuum-actuated brakes and every trailer, semitrailer, house trailer and pole trailer with a gross weight in excess of 3,000 pounds, manufactured or assembled after July 1, 1969, must be equipped with brakes acting on all wheels and of such character as to be applied automatically and promptly, and remain applied for at least 15 minutes, upon breakaway from the towing vehicle. 6. Every trailer, semitrailer, house trailer or pole trailer of 3,000 pounds or more gross weight or equaling more than 40 percent of the towing vehicle, manufactured or assembled before July 1, 1975, must be equipped with brakes on at least two wheels. 7. Except as otherwise provided by law, every motor vehicle used to tow a trailer, semitrailer, house trailer or pole trailer equipped with brakes must be equipped with means for providing that, in case of breakaway of the towed vehicle, the towing vehicle will be capable of being stopped by the use of its service brakes. 8. Air brake systems installed on trailers must be so designed that the supply reservoir used to provide air for the brakes is safeguarded against backflow of air from the reservoir through the supply line. 9. Every motor vehicle, trailer, semitrailer, house trailer or pole trailer, manufactured or assembled after July 1, 1975, and operating upon a highway must be equipped with service brakes on all wheels of every vehicle, except: (a) A trailer, semitrailer, house trailer or pole trailer of less than 1,500 pounds gross weight need not be equipped with brakes; and (b) Three-axle trucks, trucks and truck-tractors need only be equipped with brakes on all wheels of the two rear axles. [Part 6 1/2:166:1925; added 1939, 316; A 1953, 152]—(NRS A 1965, 167; 1969, 1216; 1971, 1472; 1975, 130, 1078; 1979, 854) NRS 484.595 Requirements for performance. 1. Every motor vehicle and combination of vehicles, at all times and under all conditions of loading, upon application of the service brake, shall be capable of: (a) Developing a braking force that is not less than the percentage of its gross weight tabulated in subsection 2 for its classification; (b) Decelerating to a stop from not more than 20 miles per hour at not less than the feet per second per second tabulated in subsection 2 for its classification; and (c) Stopping from a speed of 20 miles per hour, in not more than the distance tabulated in subsection 2 for its classification, such distance to be measured from the point at which movement of the service brake pedal or control begins. 2. The required braking forces, decelerations and braking distances are tabulated as follows: Brake system application Braking and braking force as a distance percentage in feet of gross from an vehicle or Deceleration initial Classification combination in feet per speed of of Vehicles weight second 20 m.p.h. Passenger vehicles with a seating capacity of 10 people or less including driver, not having manufacturer’s gross vehicle weight rating....... 52.8% 17 25 All motorcycles, mopeds and motor-driven cycles 43.5% 14 30 Single-unit vehicles with manufacturer’s gross vehicle weight rating of 10,000 pounds or less 43.5% 14 30 Single-unit vehicles with manufacturer’s gross weight rating of more than 10,000 pounds 43.5% 14 40 Combination of a two-axle towing vehicle and trailer with a gross trailer weight of 3,000 pounds or less 43.5% 14 40 Buses, regardless of the number of axles, not having a manufacturer’s gross weight rating 43.5% 14 40 All combinations of vehicles in driveaway-towaway operations 43.5% 14 40 All other vehicles and combinations of vehicles 43.5% 14 50 3. Tests for deceleration and stopping distance shall be made on a substantially level (not to exceed plus or minus 1-percent grade), dry, smooth, hard surface that is free from loose material. [Part 6 1/2:166:1925; added 1939, 316; A 1953, 152]—(NRS A 1969, 1219; 1975, 1080) NRS 484.597 Maintenance. All brakes shall be maintained in good working order and shall be so adjusted as to operate as equally as practicable with respect to the wheels on opposite sides of the vehicle. [Part 6 1/2:166:1925; added 1939, 316; A 1953, 152]—(Substituted in revision for NRS 484.440) NRS 484.599 Equipment for towing vehicle. 1. Every towing vehicle, when used to tow another vehicle equipped with air-controlled brakes, in other than driveaway or towaway operations, shall be equipped with two means for emergency application of the trailer brakes. One of these means shall apply the brakes automatically in the event of a reduction of the towing vehicle air supply to a fixed pressure, which shall be not lower than 20 pounds per square inch nor higher than 45 pounds per square inch. The other means shall be a manually controlled device for applying and releasing the brakes, readily operable by a person seated in the driving seat, and its emergency position or method of operation shall be clearly indicated. In no instance may the manual means be so arranged as to permit its use to prevent operation of the automatic means. The automatic and the manual means required by this section may be, but are not required to be, separate. 2. Every towing vehicle used to tow other vehicles equipped with vacuum brakes, in operations other than driveaway or towaway operations, shall have, in addition to the single-control device required by NRS 484.601, a second control device which can be used to operate the brakes on towed vehicles in emergencies. The second control shall be independent of brake air, hydraulic and other pressure, and independent of other controls, unless the braking system is so arranged that failure of the pressure upon which the second control depends will cause the towed vehicle brakes to be applied automatically. The second control is not required to prov

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