Figure 2 is a histogram of the work zone length data. The X axis is miles in 1 mile increments. The Y axis is Frequency (number of projects).
| Number of Work Zones | Length (in miles) |
|---|---|
| 29 | 1 |
| 21 | 2 |
| 20 | 3 |
| 9 | 4 |
| 5 | 5 |
| 10 | 6 |
| 12 | 7 |
| 5 | 8 |
| 5 | 9 |
| 6 | 10 |
| 1 | 11 |
| 4 | 12 |
| 4 | 13 |
| 1 | 14 |
| 1 | 15 |
| 3 | 16 |
| 0 | 17 |
| 0 | 18 |
| 1 | 19 |
| 1 | 20 |
| 4 | Greater than 20 |
50% of Work Zones Posted are 4 miles or shorter in length
80% of work zones posted are 9 miles or shorter in length
95% of work zones posted are 16 miles or shorter in length
Average work zone length is 6.8 miles
Median work zone length is 4.0 miles.
