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?
These are the three layers of flexible pavement.
Hot-mix asphalt, base, and sub-base
A period in a cycle when no indications are changing
Interval
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 two kinds of pavements
Flexible (asphalt) and rigid (Portland cement)
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 (VPI) is at the high or low point of the curve
FALSE
This is the station where the tangent lines cross
Point of Intersection (PI)
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?
This is the term for the allowable pavement deterioration used in the flexible pavement design method.
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?
A measure for a vehicle's impact on the pavement
Truck factor, or EALF
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 coefficient describes the strength of the underlying soil or pavement layer.