Arizona republican., 1921-04-03
D0H|O MAY ADOPT. UNIT FORM MOTOR
 VEHICLE DRAF I

AKRON, Ohio, April 2.-Ohio may pc tne first state to adopt a model iaW-suitable for uniform adoption py all other states-for the regulation or motor vehicle traffic.
 The proposed uniform vehicle law recently drafted by the motor vehicle conference committee of America has been submitted for the consideration or the general assembly, which is considering several bills to amend and augment existing statutes in regulation of motor truck weights and loads.
 This conference committee is com posed of automotive and tire experts of the American Automobile associa tion, Motor and Accessory Manufac- turers' association, National Automo- bile chamber of commerce, Rubber Association of America and the Trailer Manufacturers Association of America.
 The rapid increase in the number of motor trucks in operation with the consequent wear and tear on the highways have brought demands from many quarters for restrictions and legislation aimed to control this traffic in respect to it's liability to damage road surfaces.
 The need of such limitations and restrictions is reflected in the flood of bills pending in nearly every state legislature. But practically all these bills have been drawn without tech nical aid Or advice not only in the direction of protecting the road beds from undue injury but also of keep ing the motor trucks operating, a consideration which is regarded as equally vital.
 ha da1 a ess regulation not alone of the weight of loads permissible for motor trucks as based upon tire equipment, but also the speed of motor trucks according to such tire equipment and the weight of their loads; it also would limit the degree to which solid motor truck tires can wear down before they are past their usefulness and cease to cushion properly.
 Road impact tests of trucks on new pneumatic tires new solid tires and worn down tires, conducted by the bureau of roads of the department of agriculture, are used as a basic ar gument in favor of the triple limita tions which the conference commit tee would include in model vehicle legislation. These tests show it is stated, that a three-ton loaded truck, showing a weight of 1000 pounds per
 
 matic tires, shows a road impact per wheel of 7100 pounds when travelling six miles an hour. At ten miles an hour the road impact per wheel in creases to 700 pounds; at 14 miles the road impact ped wheel increases to $500 pounds.
 The same truck, equipped with new 26x5-inch solid dual tires, at six miles an hour shows a road impact per
  the impact is 13,900 pounds and at 14 miles it increases to 1S,700 pounds per wheel
 Equipped with worn down solid dual tires which have only seven eighths of an inch of cushioning me dium left above the tire channel, this tfuek showed road impact of 12,000 pounds per wheel at six miles, 1S,200 pounds impact at a speed of ten miles. and 26,500 pounds impact per wheel when the truck is going 14 miles an hour.
 The committee points out that, with solid tire equipment, the impact in creases rapidly with the increase of speed, but only slightly with pneu- matic tires. It is also pointed out that the more the solid tire is worn down. the heavier is the road impact The worn out solid tire gives an inn
 
 over the new solid tire.
 The committees comparison of the Abeed of pneumatic tires versus solid tires, shows that five-ton truck or pneumatics can go "A miles an houI with the same impact as a truck equipped with solid tires going eight miles an hour, and shows also that the impact of worn down solid tire increases practically directly as the increase of the load, with the speed remaining constant
 The Ohio subcommittee of the conference committee has recon mended to the Ohio legislature tho following load, tire and speed restric- tions:
 LOAD RESTRICTIONS
 The load on both wheels of tht rear axle of any motor truck shal not exceed 16,S00 pounds
 TIRE RESTRICTIONS
 Trucks fitted with solid tires shal have tires of sufficient size so tha they will not be loaded heavier thai 500 pounds per inch of width of rub Der (said rubber to be measured a the steel tire channeD; also tn tires shall not be used after they ar worn down to a certain thickness O rubber measured above the outsid edge of the steel tire channel (mini mum thickness three and finch am 5-inch tires seven eighths inches minimum thickness 6-inch, 7-incl and S-inch tires, one inch; minimum thickness 10-inch, 12-inch and 14 inch tires, one and one eight inches).
 SPEED RESTRICTIONS
 (a)-Vehicles designated for carry ing not more than seven passenger,
 Maximum weight, including gros weight of vehicle and load, TOO pounds: open country, 30 miles