2026 Clue References
This is the number of official clue resources.
What is 9?
Flow rate is assigned this letter variable in the fundamental traffic equation.
What is Q?
This tool is used to evaluate the necessity of a traffic signal at an intersection.
What is a warrant?
FHWA
What is the Federal Highway Administration?
This is the location of the 2026 Western District Annual Meeting.
What is Bellevue, WA?
Clues about traffic engineering come from this resource produced by ITE.
What is the Transportation Engineering Handbook?
This term refers to the time between successive vehicles crossing a detector, measured from the same point on each vehicle.
What is headway?
These are two types of signs that exclusively use red and white colors.
What are (2 of 4): Stop, Yield, Do Not Enter, and Wrong Way?
RTOR
What is Right Turn on Red?
This is the current president of the ITE Western District.
Who is Josh McNeill?
Information about warrant analysis in Canada can be found in this clue resource.
What is the Canadian Capacity Guide?
This term refers to the distance between successive vehicles crossing a detector, measured from the same point on each vehicle.
What is spacing?
This shape is used for all Regulatory, Warning, and Guide signs.
What is a rectangle?
TAZ
What is a Transportation Analysis Zone?
The first SLS was held in the Western District at this school.
What is CPSLO?
The Federal Highway Administration is responsible for maintaining these two clue resources.
What are Transportation Planning Process / Road Safety Fundamentals?
The measured average of all the individual vehicle speeds at a specific point is called this.
What is Time Mean Speed?
This color is reserved for signs displaying information about warnings.
What is yellow? (yellow-green accepted, but not green)
AREMA
What is the American Railway Engineering and Maintainence-of-Way Assoication?
DAILY DOUBLE
Who are Kimberly Leung and Peter Koonce?
The Transportation Research Board created this clue resource to quantify vehicle capacity on a specific mode of vehicular transport.
What is the Highway Capacity Manual?
DAILY DOUBLE
What is occupancy?
School zone signs use these two colors.
What are "Fluorescent Yellow-Green” and black?
DDHV
What is Directional Design Hourly Volume?
These are the five states that make up the Western District.
What are CA, OR, WA, AK, HI?