Final Study Deck Flashcards
What is the difference between a pre-timed signal and an actuated signal?
Pre-timed signals are set in advance and do not respond to actual traffic volume. Actuated signals timing is adjusted based on actual traffic volume. (a detector is needed)
Define “M/D/1”
queue representing departure as randomistic, arrival is deterministic in 1 service.
Define “Grade resistance”
The component of the weight vector parallel to the slope.
Define “Level of service”
a measure of quality of the transportation as the driver experiences it.
Define “Stopping sight distance”
The distance that it takes for a person to see an object and react to it or stop going a certain speed.
Define “Utility Modeling”
A form of modeling the utility functions to quantify the value that consumers place on a certain activity
Define “30HV”
Volume on the 30th highest hour of the year.
Define “DHV”
Design hourly volume.
Railroads are designed for a load greater than the gross weight of the train that they will have to support. What load are they designed to support? Why?
They are designed for Dynamic Loading because that is the greatest loading that might occur
Define “Serviceability”
Performance of the pavement as perceived by drivers.
Define “PSI”
Present serviceability index.
Define “TSI”
Terminal serviceability index.
Define “Head”
Energy per unit weight
Define “PVI”
Point of vertical intersection
Define “PVC”
Point of vertical curve
