QUIZ 1 - HWY
The _________ is a representation of the damaging effect per pass to a pavement by a type of relative to the damage per pass of a standard axle load (usually the 8,200 kg (80kN) single-axle load).
LEF
The preparation of ____________ includes grading and compaction of the roadbed soils and may include other means of providing optimum support for the pavement structure like drainage control and soil stabilization by mechanical means of by the use of soil stabilizers such as cement, asphalt-based binders, lime and water repellents.
SUBGRADE
Its purpose is to provide for an orderly arrangement of the cracking that occurs
CONTRACTION JOINTS
Its primary function is to prevent the development of damaging compressive stresses due to volume changes in the pavement slab, and to prevent excessive pressure being transmitted to adjacent structures
EXPANSION JOINTS
These are designed to hold the faces of abutting slabs in firm contact and designed to withstand the maximum tensile forces required to overcome subgrade drag
TIE BARS
It used to prevent the formation of irregular longitudinal cracks and may be keyed butt joints or mechanically formed or sawed grooves
LONGITUDINAL JOINTS
It is the portion of the total vehicle load transmitted to the road through a single axle
AXLE LOAD
It is a measure of the elastic property of soil recognizing certain nonlinear characteristics
RESILIENT MODULUS
This structure may consist of two layers, designated as the pavement slab and sub-base course
RIGID PAVEMENT
It is defined as that portion of the road or highway, placed above the subgrade specifically for the support of and to provide a running surface for vehicular traffic
PAVEMENT
It provides a stable ‘working platform’ on which to operate construction equipment during construction
SUB-BASE COURSE
The depth of formed or sawed grooves in longitudinal joints should not be less than ____% of the thickness of the pavement slab
25
This is an example of a model that account for the nonuniformity of flow are derived by assuming that the pattern of vehicle arrivals (at a specified point) corresponds to some random process
POISSON MODEL
The time between the passage of the front bumpers of successive vehicles, at some designated highway point, is known as the _____.
TIME HEADWAY
As more and more vehicles begin to use a section of highway, the traffic density will increase, and the average operating speed of vehicles will decline from the free-flow value as drivers slow to allow for the maneuvers of other vehicles. Eventually, the highway section will become so congested. This high-density condition is referred to as the _____.
JAM DENSITY
Traffic streams that operate under the influence of signals and stop signs are classified as ____.
INTERRUPTED FLOW
A traffic stream that operates free from the influence of such traffic control devices as signals and stop signs is classified as ____.
UNINTERRUPTED FLOW
Under be very low density, and the driver will be able to travel freely at a speed close to the design speed of the highway. This speed is referred to as the _____.
FREE-FLOW SPEED
This is the arithmetic mean of the vehicle speeds observed at some designated point along the roadway.
TIME MEAN SPEED
This speed is determined on the basis of the time necessary for a vehicle to travel some known length of roadway.
SPACE-MEAN SPEED
Time headway and spacing are referred to as ______ because they describe characteristics specific to individual pairs of vehicles within the traffic stream
MICROSCOPIC MEASURES
Measures that describe the traffic stream as a whole, such as flow, average speed, and density, are referred to as ______.
MACROSCOPIC MEASURES
_____ is often measured over the course of an hour, in which case the resulting value is typically referred to as volume
FLOW
Space-mean speed will always be lower than the time-mean speed, unless all vehicles are traveling at exactly the same speed
TRUE
Under jam density, you can freely choose your speed of travel
FALSE