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