Roads Open to Traffic
Percent of State highway mileage open to traffic on the previous day. Data is updated Monday-Friday. Road closures may be the result of severe events lasting more than two (2) hours, such as: flooding, landslides, bridge closures, weather events, traffic incidents, fires, etc. This measure does not include construction-related closures.
People & Freight on the Roads
Percent of highways meeting expectations for carrying loads (height, width, and weight) and traffic volumes. These parameters are defined in the below table.
|
State Highway Type |
|
Interstate |
Interregional 4-Lane |
Level 1 Freight Class |
Level 2 Freight Class |
Level 3 Freight Class |
| Bridge Height |
≤ 16.0 |
≤ 16.0 |
≤ 16.0 |
≤ 15.0 |
≤ 15.0 |
| Bridge Widen |
≤ 32.0 |
≤ 32.0 |
≤ 28.0 |
≤ 26.0 |
≤ 24.0 |
| Load Limit |
≤ 8.0 |
≤ 8.0 |
≤ 8.0 |
≤ 8.0 |
≤ 7.0 |
| Travel Way Width |
≤ 32.0 |
≤ 32.0 |
≤ 28.0 |
≤ 26.0 |
≤ 24.0 |
Capacity (traffic volume)
See table footnote for variables |
v > 21,100*Number of Lanes |
v > 20,800*Number of Lanes |
Rolling Terrain: AADT > 12,600
Level Terrain: AADT > 13,400
|
Rolling Terrain: AADT > 12,600
Level Terrain: AADT > 13,400
|
Rolling Terrain: AADT > 12,600
Level Terrain: AADT > 13,400
|
Variables
v = AADT/fHV (i.e. Volume/capacity ratio).
AADT = Annual Average Daily Traffic
fHV = 1/(1 + PHV*(EHV-1))
PHV = TAADT/AADT (i.e. fraction of the total traffic volume that is trucks)
TAADT = Annual Average Daily truck Traffic
EHV = Passenger car equivalent of a truck (by default this value is 2.0)
Roads Impacted by Construction
The miles of State highway with any active construction work or material curing which impact normal traffic flow. For a map of the locations included, click the dial.
Color Definitions
- Poor performance (i.e. not meeting target).
- Good performance, but at risk of falling below target.
- Good performance.
- Information only; no target has been set.
