美国养护工区特征分析
Table 2. Work Zone Characteristics by Snapshot, 2001-2003
美国养护工区特征分析
National Estimate Summer
2001(NHS)
Number of Work Zones
Lane-Miles of Lost
Capacity
Percent of NHS with Work
Zone3,1102,64312.8%Winter20022,9823,0436.9%Summer20026,4465,09820.9%Winter20032,6751,9337.4%Summer20037,1415,29927.0%
Table 3. Estimates of Work Zone Impact on NHS, 2001-2003
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