Traffic Controls
This is the color used for navigation and guidance signs
Green
Vertical curves are represented by this geometry
Parabola
This is the maximum superelevation allowed when snow or ice are likely
0.08
This four-letter acronym describes what drivers go through when they need to react to a changing condition.
What is PIEV?
This is the reference weight for a single axle equivalent load.
What is 18,000 pounds?
This traffic control device allows for multiple simultaneous movements with very little maintenance, but some people don't like them for some reason
What are roundabouts?
Stopping sight distance for this curve is based on a headlight's vertical sweep angle
What is a sag vertical curve?
This is the station where the curve begins
Point of Curvature
The primary through movements of an intersection signal timing have these phase numbers.
2 and 6
These are the inputs to the AASHTO flexible pavement design function.
What are reliability, standard deviation, traffic load, resilient modulus, and
\Delta PSI
This the spacing that more people will accept than reject when using the minor approach at an unsignalized intersection.
Critical Gap
True or false: The vertical point of intersection (PVI) is at the high or low point of the curve
FALSE
This is the station where the tangent lines cross
Point of Intersection (PI)
Roadway segments use this crash rate
What is Rate per Hundred Million Vehicle Miles (RHMV)?
A scale that describes pavement quality from 1 to 100.
What is PCI / CCI?
An intersection should meet one of these to be considered for a signal
A warrant
These are the units of grade in the vertical curve equations.
What is rise over run? (Need to take % * 0.01)
This coefficient is about 1/3 of its stopping counterpart
f_s : the coefficient of side friction factor
This graph can be used to evaluate traffic signal progression on a corridor
What is a time space diagram?
This is the tolerance for asphalt thickness.
What is a half-inch? (0.5 inches)
The parameter used to determine if a stop or yield sign is necessary at an approach
Critical Approach Speed
Stationing on vertical curves is on this basis.
What is the horizontal line?
This is the distance that needs to be kept clear on a horizontal turn
M_s: Middle Ordinate for sight
This exists when it is impossible to either stop or safely proceed through an intersection when the light changes yellow.
Dilemma zone
This is the tolerance for base and sub-base layers.
What is one whole inch?