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)