is the commonly used statistics to determining upper speed limits of vehicles.
85th percentile value
is the term used to designate the maximum number of passenger cars that can pass a given point per hour under the most nearly ideal roadway and traffic conditions.
Basic capacity
the standard sign shape which is used only to warn of existing or possible hazard.
Diamond shape
is the time elapsed during emotional sensation and disturbance such as fear, anger or any other emotional
feelings such as superstitions with reference to the situation.
Emotion time
the standard sign shape which is reserved exclusively for the yield sign.
Equilateral triangle shape
is a method of trip distribution involving the use of existing volumes of interzonal traffic to measure friction prior to the expanding volume between two points in proportion to an inter-actance factor.
Growth factor method
is the time required for understanding the situation which is also the time required for comparing the difference thoughts, regrouping, and registering new sensations.
Intellection time
the standard sign shape which is reserved exclusively for the stop sign.
Octagon shape
is the time required for a driver to realize that brakes must be applied.
Perception time
is the maximum number of vehicles that can pass a given point on a lane or roadway during one hour
under prevailing roadway and traffic conditions.
Possible capacity
is the time taken from the instant the object is visible to the driver to the instant the brakes are applied
Reaction time
the standard sign shape which is used for regulatory signs with the expectation of stop and yield signs.
Rectangle shape
the standard sign shape which is used for guide and information signs
Rectangle shape
the standard sign shape which is used for the advance warning of a railroad crossing.
Round shape
is the distance at which a driver can see an object lying in the roadway ahead. It should equal or exceed the stopping sight distance.
Sight distance
in the design of auxiliary lanes, it is known as the number of cars that need to be stored during peak
hours.
Traffic capacity
is the number of vehicles occupying a unit length of the lane of the roadway at a given instant, usually
expressed as vehicles per km.
Traffic density
is the number of vehicles that pass a point on a highway during a specified time interval.
Traffic volume
is the time taken for the final action.
Volition time
