| Acronyms | Equations | LOS | Random |
|---|---|---|---|
|
Traffic Impact Analysis
What is TIA
|
Perception-Reaction Time Distance
What is 1.47vt
|
Capacity
maximum sustainable hourly flow rate
|
Stopping sight distance
Minimum sight distance required for a driver to stop a vehicle after seeing an object in the roadway without hitting the object
|
|
Average Daily Traffic
What is ADT
|
Density
What is Vp/S
|
LOS measures...
Speed, travel time, density, maneuverability, comfort, convenience.
|
Tangent distance
Distance from the PC to the PI and the PI to the PT
|
|
American Association of State Highway and Transportation Officials
What is AASHTO
|
Degree of Curvature
What is 18000/(pi x R)
|
Annual Average Daily Traffic
Based measure of traffic demand averaged over 365 days
|
Cuts (excavation)
The amount of material to be removed in cubic feet or yards
|
|
Percent Time-Spent-Following another vehicle
What is PTSF
|
Minimum Length
What is 2S-(2158/A)
|
Passing Lanes
Provide opportunity to pass slower moving vehicles increasing ATS and decreasing PTSF
|
Vertical curves
Usually parabolic with 2 types: crest and sag
|
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