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of local streets, however environmental factors are generally responsible for the majority <br />of pavement wear and deterioration for Arden Hills streets and therefore significant <br />extensions of pavement life are unlikely." <br />The NSWMA response goes on to state the following. <br />a) It must be acknowledged that no data is available as to how much longer a city road will <br />last if government managed collection is implemented. In the cities where it has been <br />discussed, city staff has been unwilling to commit to a specific reduction in road repairs <br />budgets. <br />b) In fact, we believe, depending on the configuration of the trucks used, reducing the <br />number of trucks running on the streets may increase road wear. For example, if you <br />have 20 tons of waste in a community hauled by one truck versus having 4 trucks and 4 <br />different haulers you are dividing the 20 tons into 4 loads instead of 1. <br />c) If the goal is reduced truck traffic on City streets, the only responsible action is to <br />regulate and reduce all types of traffic including lawn care, delivery vehicles and the <br />postal service. <br />It is unclear what is meant by statement b, above. Assuming that the intention is to show that <br />one larger truck does more damage than four smaller trucks, consider the following example, <br />using real truck axle weights and payloads. <br />Table 3. ESALs per Cubic Yard by Truck Capacity. <br />Payload Capacity, cy <br />40 <br />11 <br />Axle Configuration <br />Front Axle <br />Single <br />Single <br />Rear Axle <br />Dual Tire, <br />Tandem Axle <br />Dual Tire, <br />Single Axle <br />Axle Gross Weights, loaded <br />Front Axle, lbs <br />20,000 <br />12,000 <br />Rear Axle, lbs <br />46,000 <br />18,000 <br />ESALs per Vehicle (computed <br />by MnDOT's MnPAVE <br />software) <br />3.61 <br />1.22 <br />Total ESALs and Capacity <br />3.61 ESALs <br />40 cy <br />4.88 ESALs <br />44 cy <br />ESALs per cy <br />0.090 <br />0.111 <br />This analysis shows that by using four smaller trucks, about 23% more damage is imparted to a <br />typical city street than by using a single, large truck. This is due to, and in spite of, several <br />factors. <br />• Each of the four smaller trucks has its own empty vehicle weight. <br />12 <br />