美国养护工区特征分析

State websites are moving away from an internal project-level data reporting scheme to a more motorist-oriented daily lane closure reporting format.

In some states, the number of work zones reported on websites has risen dramatically (e.g., Maine reported 2 work zones in 2002 and 222 in 2003). This

increase reflects an increased effort to report many lane closures, not just those

associated with a few high-visibility projects.

Although a rise in the number of work zones being reported to the web can be observed, far less dramatic change has been observed in the type of data elements

provided. For example, delay advisories have remained uncommon throughout

all five snapshot studies.

ConclusionsBecause of the type of data obtained in this study, there will always be a challenge in discerning changes in “on the ground” roadwork and changes in state policies on the format and content of their road closure and construction websites. For example, average reported project duration has fell from 142 days in summer 2002 to 98 days in summer 2003. Although this may reflect a trend towards more rapid completion of roadwork projects from innovative management and contracting efforts, it is confounded to some degree by a shift in web reporting format away from a project orientation and towards a lane closure schedule reporting format.the Texas Transportation Institute (TTI) where detailed paper records were analyzed in six jurisdictions across the nation. The TTI study estimated that 19-24% of the NHS had a work zone during the peak construction season in 2001, comparable to our 2002-03 estimates of 20-27%. Similarly, characterization of lane closure management such as nightwork were also comparable, with both TTI and the snapshot studies estimating that roughly one-third of all lane closure activity occurs as nightwork.cost-effectively characterize from paper records on a routine basis. Although there are limitations in the data obtained, one can estimate key measures on a national scale that have never been systematically tracked in the past. Clearly some of the key measures needed at the national level (exposure and delay) are not yet supported from web-baseddata. This issue may be resolved over time as more uniform and more standardized work zone data is presented on the web. Efforts at the federal level to establish guidelines on work zone data reporting will significantly strengthen the snapshot approach to national