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Figure 4 shows an example of the distribution of pavement condition index values over a street <br />network with and without additional heavy vehicles, at 5 and 10 years after the analysis begins. <br />The solid bars indicate the distribution of pavement condition without the additional heavy <br />vehicles, and the striped bars indicate the condition distribution with them. As can be seen in the <br />figure, the additional five years of traffic seems to have had a greater impact on the overall <br />network condition, but this is somewhat deceiving, since the analysis also omits the impact of <br />that many years of pavement maintenance and rehabilitation. The relative impact, however, can <br />be seen where the 5-year chart shows fewer pavement sections in the 70-80 category and more in <br />the 50-70 category, indicating an overall decrease in pavement condition across the network. <br />Network PCI Distribution • Without Additional Heavy Vehicles <br />after 5 Years ® With Additional Heavy Vehicles <br />100% <br />y 90% <br />80% <br />d <br />E 70% <br />m 60% <br />50% <br />40% <br />30% <br />4) <br />a) 20% <br />a- 10% <br />0% <br />90-100 80-90 70-80 50-70 30-50 0-30 <br />Pavement Condition, With and Without <br />Additional Heavy Vehicles <br />Network PCI Distribution <br />after 10 Years <br />100% <br />N 90% <br />c 80% <br />m <br />E 70% <br />y 60% <br />w 50% <br />40% <br />C <br />cD 30% <br />y 20% <br />d 10% <br />0% <br />■ Without Additional Heavy Vehicles <br />® With Additional Heavy Vehicles <br />90-100 80-90 70-80 50-70 30-50 0-30 <br />Pavement Condition, With and Without <br />Additional Heavy Vehicles <br />Figure 4. Sample network PCI distribution after 5 and 10 years. <br />24 <br />