Terminology
This Manual defines capacity
What is the Highway Capacity Manual
DHV is used for this
What is to determine the number of traffic lanes on a roadway (because it represents the peak volumes that the facility should encounter)
These are the four major roadway functional classes
What is freeway, arterial, collectors, local streets
These are the three types of access control
What are full, partial, and permitted
A roundabout will always provide a _____ capacity and _____ delays than AWSC operating with the same traffic volumes and right-of-way limitations.
What is Higher and lower
These are the factors that influence capacity.
Lane widths/design speed/traffic composition/ number or type of lanes/ terrain/ geometry/ control type/ passing zones/ location/ access density
In this stage of design traffic counts are requested
What is concept
These three components make up the total length of the upstream intersection functional area
What is perception Reaction , maneuver, stopping/queuing/storage length
These are common roundabout shapes
What is circle, ellipse, teardrop, peanut, dog bone
This is how capacity is rated
What is Level of Service (LOS)
This is density (in relation to capacity)
vehicles per mile
These are the LOS categories
A-F
These factors affect control delay
Control
Geometrics
Traffic
Incidents.
These projects don't require ICE to be performed (give two)
-Resurfacing
-Signal timing and maintenance
-Signal Permit revision w/ no changes to physical footprint of intersection
-Sidewalk/streetscape improvements
-Bridge replacement (with no realignment or relocation of intersection)
These are the two types of flow.
What is interrupted and interrupted flow
This is an interrupted flow facility
What is a traffic signal?
(Ped crossing, ramp intersection, new interchange, off street ped & bike facility)
This is the GDOT preferred LOS
What is LOS C
These are the components of a two stage gap acceptance intersection
-Two-part intersection
-Minor street vehicle crosses one direction of the major street traffic
-Storage in median
-Waits for a 2nd gap in the other in the other direction of the major street traffic
Roundabouts have this many conflict points compared to a signalized four leg intersection that has 32
What is 8
This is the formula for AADT
Total vehicles/ 365 days
Level of Service F an also be referred to as this.
What is Over saturated Flow
The typical speed design range for a 4 lane arterial highway in a rural area
What is 55-65mph
This is when an exclusive right turn is provided
What is a when right turn volume exceeds 300vph and the adjacent through volume exceeds 300 vph per lane
These are four intersection alternatives in ICE
-Minor stop
-all way stop
-RIRO
-Signalized
-RAB
-RCUT
-MUT
-Green T
-DLT/CFI
-Jug handle
-Diamond