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Conference Proceedings 26 - Transportation Research Board

Conference Proceedings 26 - Transportation Research Board

Conference Proceedings 26 - Transportation Research Board

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SUMMARY OF PEER EXCHANGE ON DATA FOR PERFORMANCE MEASURES 213sures also compute the ratio of treatment life to pavingcycle.As for bridges, according to Ron Tweedie, NewYork ‘‘has lots of old ones.’’ A bridge condition indexis used to track the 7,600 state highway systembridges. Primary concerns are safety, preservation,and serviceability. Safety measures include vulnerabilityto erosion and structural condition.Mobility, as NYSDOT defines it, is the ability tomove people and goods conveniently, reliably, safely,and at a reasonable cost. Measures used includethose related to congestion. NYSDOT is interested indeveloping measures based on the value of time inaddition to travel time itself. The department is alsointerested in ton-miles of delay due to the importanceof shipping time but acknowledges the difficulty inobtaining good data about shipment travel times.Safety issues revolve around reducing the numberof high-accident locations (HALs), the number ofhighway safety inspections conducted, and inclusionof HALs in the annual work program.A discussion ensued regarding the use of mobilityindices, that is, aggregated measures that consider severaldifferent components of mobility rolled up into asingle measure or index. Opinions were divided, witha slight majority of the group seeming to agree thatsingle indices are inappropriate for describing mobilityand perhaps other system focus areas. Mobility maybe particularly resistant to meaningful indexing becauseit is a complex concept and measured in such awide variety of ways in different states. More statesseem to have pursued the development of indices inother system areas, such as safety, system condition,and maintenance, than in mobility.

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