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Traffic Engineering Handbook
MUTCD
HCM
HSM
Acronyms
100
The year of the first publication of the Traffic Engineering Handbook.
What is 1941?
100
This color is used to indicate stop or prohibition.
What is red?
100
This factor is a measure of how much of peak hour factor occurs in the peak 15 minutes of the peak hour.
What is the peak hour factor (PHF)?
100

This term is the number of crashes that occur at a given site during a certain period of time in relation to a particular measure of exposure.

What is the crash rate?
100
VMT
What are vehicle-miles traveled?
200

The distance between back of lead vehicle to front of trailing vehicle.

What is the gap?
200
This color indicates permitted movement and direction guidance.
What is green?
200
This factor describes the proportion of AADT occurring during the peak hour.
What is the K-factor?
200
This factor, along with vehicles and roadway environments, is one of the three general contributing factors to crashes.
What is a human?
200
FHWA
What is the Federal Highway Administration?
300
This type of vehicle is defined by having a capacity of more than 15 passengers.
What is a bus?
300
The number of types of object markers defined by MUTCD
What is 4?
300
The three driving subtasks.
What are control, guidance, and navigation?
300

This is the time it takes a driver to detect a target, process the information, decide on a response, and initiate a reaction.

What is perception-reaction time (PRT)?
300
BFFS
What is base freeflow speed?
400

This is the transfer of normal operation of traffic control signals to a special control mode to assist passage of emergency vehicles and other designated traffic such as ships and trains.

What is preemption control?
400
This is the color used for incident management.
What is fluorescent pink?
400

The flow rate per lane at which vehicles can pass through a signalized intersection if a green signal was displayed for the full hour, the flow of vehicles never stopped, and there were no large headways.

What is the saturation flow rate?
400
This scale is used to classify crash severity.
What is the KABCO scale?
400
MPO
What is a metropolitan planning organization?
500

These define the minimum threshold levels for a set of objective traffic and pedestrian conditions.

What are warrants?
500
The color relating to pedestrian, school, and bicyclists.
What is fluorescent yellow-green?
500

The area located immediately between the left edge of a ramp pavement and the right edge of the roadway pavement at a merge or diverge area.

What is the gore area?
500
This term refers to the practice of placing signs at the optimal location where the information is most needed.
What is primacy?
500
RPM
What is a raised pavement marker?