Permitted Lane Closure
Permitted Lane Closure
Calculations
Work Zone Capacity per Lane:
The Highway Capacity Manual 2010, Equation 10-9 is used to determine theoretical capacity of the roadway lane. The calculation has been simplified to only have two variables: terrain and truck percentage.
| Work Zone Capacity (vphpl) *, ** | TRUCK PERCENTAGE | ||
| Terrain | 0-<15% | 15-<30% | 30%+ (used 40%) |
| Level | 1490 | 1390 | 1330 |
| Rolling | 1310 | 1100 | 1000 |
| Custom | Please contact ODOT Central Office Coordinator for use of custom capacities. These are only to be used for unique circumstances. | ||
* Work Zone Intensity is assumed to be 0 vphpl (vehicles per hour per lane).
** Work Zone Ramp Factor is assumed to be 0 vphpl (vehicles per hour per lane).
Calculation Process:
Select segment of freeway or expressway to be analyzed.
Determine segment characteristics - driver type (urban/rural), terrain type, and number of available lanes.
Determine calculation method to be used from below ranked in order of priority:
Method A – ATR – Actual Hourly Breakdowns for Section: the ATR is located within the segment
Method B – ATR – Hourly Percentages: the ATR is upstream or downstream of the segment on the same route
Method C – Hourly Percentage from a close ATR applied to AADT: the ATR is on a
different route but has similar traffic distributions
Method D – AADT using statewide distribution
Select work zone lane capacity from table based on the truck percentage and terrain for the freeway or expressway segment.
Determine hourly closure volumes – if the volumes exceed work zone capacity (vphpl), a closure is not permitted without further analysis.
WEEKDAY closure times are calculated
as follows:
|
For URBAN locations, the seasonal adjusted
Friday ADT in |
|
|
WINTER |
February |
|
SPRING/FALL |
May |
|
SUMMER |
August |
|
For RURAL locations, the seasonal adjusted
Thursday ADT in |
|
|
WINTER |
February |
|
SPRING/FALL |
May |
|
SUMMER |
August |
WEEKEND closure times are calculated
as follows:
|
For URBAN locations, the seasonal adjusted
Saturday ADT in |
|
|
WINTER |
February |
|
SPRING/FALL |
May |
|
SUMMER |
August |
|
For RURAL locations, the seasonal adjusted
Friday ADT in |
|
|
WINTER |
February |
|
SPRING/FALL |
May |
|
SUMMER |
August |
Define District Comments (e.g., if there is a Browns game, no lane closures in the inbound direction will be allowed for two hours before and in the outbound direction two hours after game, etc.)
Please contact the appropriate District Work Zone Traffic Manager for information on segments that are not stored in the online database.