Bureau of Transportation Statistics (BTS)
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TABLE 2 - Profile of the Attribute Range in the SC Design

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  Free flow time Slowed down time Variability Running costs Toll costs
Level 1 −50% −50% 5% −50% −100%
Level 2 −20% −20% 10% −20% 20%
Level 3 10% 10% 15% 10% 40%
Level 4 40% 40% 20% 40% 60%