Highway Capacity Manual
This term is a group of vehicles or pedestrians traveling together as a group.
What is a platoon?
This is the year the most recent Highway Capacity Manual was published.
What is 2022?
The part of the signal cycle allocated to any combination of traffic movements receiving the right-of-way simultaneously during one or more intervals.
This is the background color for Do Not Enter and Wrong Way Signs.
What is red?
This is an unsignalized intersection with a circulatory roadway around a central island with all entering vehicles yielding to the circulating traffic.
What is a roundabout?
This is the space or time between two vehicles, measured from the rear bumper of the first vehicle to the front bumper of the second vehicle.
What is gap?
This is the year that the first AASHTO Green Book was published.
What is 1984?
This is a signal control in which the cycle length, phase plan, and phase times are constant.
What is pretimed or non-actuated signal?
This is the background color for warning signs.
What is yellow?
This functional category of a street allows trips of moderate length within a relatively small geographical area.
What is a minor arterial?
This is the crossing, merging, or diverging of two traffic movements at an intersection.
What is a conflict?
This is the year that the first HCM was published.
What is 1950?
This term is a set of lanes at an intersection that accommodates all left-turn, through, and right-turn movements from a given direction.
What is an approach?
This is the background color for guide signs.
What is green?
This is a major surface street with relatively long trips between major points, and with through-trips entering, leaving, and passing through the urban area.
What is a principal arterial?
This is factor accounts for driver characteristics that differ from base conditions and their effects on traffic.
What is a driver population factor?
The Transportation Research Board was established in this year as the "National Advisory Board on Highway Research."
What is 1920?
This is the time at the end of a signal phase during which the movements served by that phase are not used by traffic because drivers decelerate and stop in response to a yellow indication.
What is lost time?
This is the background color for construction and maintenance signs.
What is orange?
These are interchanges in which freeway entry and exit ramps are separated at the street level, creating four intersections.
What are diverging/split diamond interchanges?
This is the condition in which the back of a queue extends beyond the available storage length.
What is queue spillback?
What is 1930?
This is the segment of the cycle length allocated to each phase or interval that may occur.
What is a split?
What is the background color for information signs related to motorist services and evacuation routes?
What is blue?
In Massachusetts, this is an unsignalized intersection with a circulatory roadway around a central island with all entering vehicles yielding to the circulating traffic.
What is a rotary?