Traffic Stream Parameters
What is uninterrupted flow?
The flow rate arriving to an interruption on a roadway, such as an intersection or crash
What is traffic arrival?
LOS
What is Level of Service?
An at-grade crossing of roadways
What is an intersection?
The ITE district we are in
What is the mountain district?
The macroscopic traffic stream parameter measured in vehicles per hour
What is flow?
The characteristic of deterministic arrival
What are uniform headways?
Temporary or permanent increases in traffic, either expected or unanticipated
What are bottlenecks?
The area holding queued vehicles
What is a turn bay?
The current ITE International President
Who is Karen Aspelin?
The number of vehicles occupying a unit length of roadway
What is density?
Random headways for traffic arrival
What is Markov arrival?
A wave of congestion that propagates upstream from recurring and nonrecurring bottlenecks
What is a shockwave?
The phase allowing for vehicles that entered at the end of yellow interval to clear the intersection before the next green phase starts.
What is All-Red Time? (or clearance interval)
The year ITE was founded (within 5 years)
What is 1930?
The time between front bumpers
The ratio of average arrival to departure rates
What is traffic intensity? (rho = lambda/mu)
The range of LOS scores
What is A to F?
The typical installation cost of a signalized intersection (within $25,000)
$300,000
The year of the first Traffic Bowl
What is 1991?
The basic relationship between traffic flow, speed, and density
What is q=uk? (flow = speed * density)
The variable used to represent traffic arrival rate
What is lamba?
The speed of traffic up until the breakpoint
What is Free Flow Speed?
The requirement that an intersection must reach before necessitating signalization
What is a warrant?
The winningest student chapter team in Traffic Bowl history
What is Purdue University?