美国养护工区特征分析
80%
Percent of Sample Work Zones Active by Time of Day
70%60%50%40%30%20%10%
0%
t
11 AMM10 PMM10 AMidnigh11 PMMMMMMMMMM7 PMMMMM1 A2 A3 A4 A5 A6 Aoon1 PM6 P8 PM7 A8 A9 A2 P3 P4 PN5 P9 P
M
Figure 2. Work Zone Activity/Lane Closures By Time-of-Day (Summer 2003)
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