FSUTMS Comprehensive Modeling Workshop - Cambridge ...

Ridership
Number of individuals using a transit line. Used as an assessment of a transit line’s
attractiveness.
RMSE
Root Mean Square Error is a measure of total error defined as the square root of the sum
of the variance and the square of the bias. It assumes that larger forecast errors are of
greater importance than smaller ones; hence they are given a more than proportionate
penalty.
Screenline
An imaginary line, usually along a physical barrier such as a river or railroad tracks,
splitting the study area into parts. Traffic counts and possibly interviews are conducted
along this line, and the crossings are compared to those calculated from the home
interview data as a check of survey accuracy. Crossing may also be compared with
model estimates as part of calibration.
Selected Link Analysis
Traces the entire length of each trip passing through a particular link or set of links along
the network to determine where such trips are coming from and going to.
Selected Zone Analysis
Traces the entire length of each trip traveling to or from a particular zone or set of zones.
Shortest Path
A path representing the least cost option of traveling between any specific origin and
destination pair.
Socioeconomic Data
Demographic data, such as household, population, and employment characteristics, that
are input into the model to determine the impact on trip-making patterns.
SOV Trips
Single Occupancy Vehicle trips, or drive-alone trips, represent the number of trips with
only one person in the vehicle, including the driver.
Special Generators
Concentrations of activities of such size or unusual nature to warrant special
consideration in trip generation analysis.
Station
A node in the transit network that offers an opportunity for automobile access.
Stop Node
A node along a transit line that represents an opportunity for boardings and alightings.
FSUTMS Comprehensive Modeling Workshop– Glossary of Terms Page 19