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Acronyms Equations LOS Random
100
Traffic Impact Analysis
What is TIA
100
Perception-Reaction Time Distance
What is 1.47vt
100
Capacity
maximum sustainable hourly flow rate
100
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
200
Average Daily Traffic
What is ADT
200
Density
What is Vp/S
200
LOS measures...
Speed, travel time, density, maneuverability, comfort, convenience.
200
Tangent distance
Distance from the PC to the PI and the PI to the PT
300
American Association of State Highway and Transportation Officials
What is AASHTO
300
Degree of Curvature
What is 18000/(pi x R)
300
Annual Average Daily Traffic
Based measure of traffic demand averaged over 365 days
300
Cuts (excavation)
The amount of material to be removed in cubic feet or yards
400
Percent Time-Spent-Following another vehicle
What is PTSF
400
Minimum Length
What is 2S-(2158/A)
400
Passing Lanes
Provide opportunity to pass slower moving vehicles increasing ATS and decreasing PTSF
400
Vertical curves
Usually parabolic with 2 types: crest and sag




Transportation Jeopardy

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