Traffic
This is the maximum flow rate on a road.
What is the capacity?
This is the color used for navigation and guidance signs
Green
Vertical curves are represented by this conic section geometry
Parabola
The three layers of asphalt pavement
A philosophy for designing enduring systems
What is sustainability?
The ratio of a weighted maximum 15 minute flow to the hourly flow.
What is the peak hour factor (PHF)
Stopping sight distance includes these two components
Reaction distance and braking distance
Stopping sight distance for this curve is based on a headlight's vertical sweep angle
What is a sag vertical curve?
What is the WHOLE INCH?
Rail ties are embedded in this aggregate layer.
What is ballast?
This macroscopic model is based on a linear relationship between speed and density.
What is the Greenshields model?
This is the space that most people will accept when using an unsignalized approach.
Critical Gap
This is the maximum superelevation allowed when snow or ice are likely
0.08
The tolerated pavement deterioration used in design.
Delta PSI
This mode is the most efficient at moving large amounts of goods on land.
What is rail?
The product of speed and density
What is flow rate?
These are the four stages of reaction
Perception, Identification, Emotion, Volition
This coefficient is about 1/3 of its stopping counterpart
f_s: the coefficient of side friction factor
A measure for a vehicle's impact on the pavement
The graphic device that shows prevailing wind speeds and probabilities.
This is the elapsed time between similar points on successive vehicles.
What is headway?
This coefficient helps determine how many crashes will be avoided with a specific mitigation
Crash Reduction Factor
This is the distance that needs to be kept clear on a horizontal turn
M_s: Middle Ordinate for sight
This coefficient describes the strength of the underlying soil or pavement layer.
Resilient Modulus
The apron and aircraft stands are on which side of an airport?
What is the airside?