| Design Hourly Volume | |||||||||||||||
| 2.12 | |||||||||||||||
| Current | 10 Years | ||||||||||||||
| Year | Later | ||||||||||||||
| b | c | ||||||||||||||
| ADT | 6915 | 9660 | |||||||||||||
| K | |||||||||||||||
| Source | 30th Highest Hour | 15.0% | 1037 | 1449 | |||||||||||
| Figure 2.12, page 50 | 10th Highest Hour | 17.5% | 1210 | 1691 | |||||||||||
| AASHTO Exhibit 2-28 | Highest Hour | 24.0% | 1660 | 2318 | Capacity Exceeded | ||||||||||
| Capacity | 2000 | 2000 | |||||||||||||
| Roadway Design Engineers usually use the K30 DHV for Design and Analysis | |||||||||||||||
| Traffic Engineers usually use the Peak Season PM Peak Hour for Design and Analysis | |||||||||||||||
| This roughly corresponds to a K100 DHV | |||||||||||||||
| Why do we do this? Data is much easier to get. | |||||||||||||||
| K30 | = | V30 / AADT | |||||||||||||
| Example: | K30 | = | 1500 / 10,000 | = 15% | |||||||||||
| AADT = Average Annual Daily Traffic (a continuous count for the entire year) | |||||||||||||||