Figure 3 is a histogram of the work zone length data. The X asis is duration of work zones in days, weeks, months, and years. The Y axis is Frequency (number of projects).
| Number of Work Zones | Duration |
|---|---|
| 23 | 1 day |
| 22 | 2-3 day |
| 37 | 4-7 day |
| 17 | 1-2 weeks |
| 41 | 2-4 weeks |
| 89 | 1-2 months |
| 155 | 2-4 months |
| 87 | 4-5 months |
| 25 | 6-9 months |
| 13 | 9-12 months |
| 41 | 12-18 months |
| 2 | 18-24 months |
| 9 | 2-3 years |
| 1 | 3-5 years |
| 1 | 5+ years |
Average work zone duration is 125 days (about 4.0 months)
50% of work zones posted have durations of 6 months or less
95% of work zones posted have durations of 18 months or less
