Terms-for-Finals Flashcards
(43 cards)
What is asphalt?
A dark brown to black cement-like material primarily consisting of bitumen, obtained naturally or through petroleum processing.
Asphalt is commonly used in road construction.
Define base in the context of road structure.
The top surface of a road structure that receives traffic load and transfers it to the subgrade.
It is crucial for the stability of roadways.
What is a base coat?
A plaster coat or coats applied prior to the finish coat.
This is part of the layering process in road construction.
What is a collector street?
A type of street that serves internal traffic movements within an area and connects this area with major arterials.
Define expressway.
A divided arterial highway for through traffic with full or partial control of access and generally with grade separation at intersections.
What distinguishes a freeway from an expressway?
A freeway has full control access.
How is the hardness of asphalt cement determined?
By conducting a penetration test.
What does the term highway denote?
A public way for vehicular travel, including the entire area within the right of way.
What is an interchange?
A system of interconnecting roadways providing for the interchange of traffic between two or more intersecting highways, usually without at-grade crossings.
What is an intersection?
An area where two or more roads come together.
Define overpass.
A major highway raised above general ground level by embankment and an overbridge across another highway.
What is pavement?
The layered structure placed over a soil sub-grade for forming a road.
What is a prime coat?
The single application of liquid bituminous material to a previously prepared and untreated road base.
What is a road bed?
The graded portion of a highway within the top and side slopes, prepared as a foundation for the pavement structures.
What is a seal coat?
A very thin surface treatment of bituminous material applied as a final step in the construction of certain bituminous wearing surfaces.
Define sub-base.
The part of the road structure immediately above the subgrade, composed of stone boulders or superior soil.
What is subgrade?
The layer of natural soil over which the pavement of a road is laid.
What is a tack coat?
The single initial application of bituminous material to an existing surface.
Define underpass.
A major highway taken below ground level to cross another road by means of an underbridge.
What is a wearing course?
The layer in a road pavement that provides resistance to wear and tear due to traffic.
What is the 85th percentile value?
A statistic used to determine upper speed limits of vehicles.
Define basic capacity.
The maximum number of passenger cars that can pass a given point per hour under ideal conditions.
What shape is exclusively used for yield signs?
Equilateral triangle shape.
What is the purpose of the growth factor method?
To measure friction in trip distribution using existing volumes of interzonal traffic.
