Exam 1
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| Accessibility | the ability to reach a destination with reasonable effort or cost
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| Destination | place where a trip ends
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| Origin | place where a trip begins
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| Intermodal transfer points | places where there is a change of mode
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| Intermodal transport | used when two or more modes are involved in the movement of goods from an origin to a destination (i.e., rail and truck, water and rail, water and highway, water and water, air and highway)
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| Line haul | one segment of a trip
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| Mobility | the ability to make trips
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| Mode | The form of transport – highway, air, carpool
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| Primary data | Data collected directly by the analyst
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| Secondary data | Data borrowed from other places or from previous activities in the same place
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| Transit-dependent or captive riders | These are primarily non-drivers, who cannot afford to own an automobile, too young or too old to operate a motor vehicle, and those with disabilities.
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| Transportation | everything involved in moving either the person or goods from the person or goods from the origin to the destination..
Transportation Engineering - An Interdisciplinary Engineering/integration of multiple disciplines
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| Capacity | The amount of goods and/or persons a system can handle before reaching saturation.
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| Classification | the process of breaking down the total number of vehicles observed into categories or classes
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| Density | A measure of traffic congestion, the number of vehicles per unit length of a roadway
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| Design Hourly Volume (DHV) | The hourly volume used by roadway designers to determine the capacity needed
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| Free-flow speed | Speed that can be maintained on a given roadway when no other vehicles are present
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| Gap | The space between consecutive vehicles, rear bumper to front bumper
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| Headway | Time or distance between consecutive vehicles
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| Jam Density (Dj) | The maximum possible density on a roadway
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| K-factor | the proportion of daily traffic at a site that occurs during the peak period
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| Level of Service (LOS) | a letter designation that describes a range of operating conditions on a particular type of facility.
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| Occupancy | The percent of time in which a point in the roadway has a vehicle that is directly over it.
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| Peak hour factor (PHF) | The ratio of the number of vehicles during the peak hour to four times the number of vehicles entering the traffic stream during the peak 15-minute period.
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| Space mean speed (SMS) | The average speed of all vehicles moving over a given section of a highway over some specified time period
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| Time mean speed (TMS) | The average speed of all vehicles passing a point on a highway over some specified time period
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| Traffic counts – (volume) | the number of vehicles that pass a point during a specified time period
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| Traffic flow rates (q) | usually in units of vehicles per hour, converted from volume counts taken over different lengths of time, or as a function of average headway ALWAYS ROUND TO NEAREST VEHICLE!
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| Basic freeway segments | Segments of the freeway that are outside of the influence area of ramps or weaving areas and have uniform traffic and roadway conditions
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| Freeway | a divided highway that provides uninterrupted flow
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| Derived demand | The recognition that a trip is made because of the activities to be undertaken at the end of the trip.
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| Modal Split | Determines which mode of transportation will be used to make the trip
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| Peak hour of the generator | The 60-min. period in which the highest volume entering and leaving the site occurs
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| Peak hour of the street | The 60-min. period in which the highest volume occurs on the roadway abutting the site (generally 7–9 a.m. or 4–6 p.m.)
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| Peak-hour trips | The total number of vehicular trips to and from a site during a 60-min period
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| Traffic Analysis Zone (TAS) | A geographic subset of a study area
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| Trip assignment | A procedure by which traveler route choice in a street or highway network is simulated
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| Trip distribution | A procedure to describe and explain how travelers choose their destinations
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| Trip generation | A procedure to estimate how many trips are made to and from certain locations, such as households, individual sites, or TAZs
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| Trip, trip end | a one-direction vehicle movement either to or from the study site (i.e., an origin or a destination within the study site) – each trip has two ends
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| Programming | used to describe the selection and scheduling of projects
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| Stakeholder | a person, a group of persons, a company, or an organization that has a stake in the decisions being made
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| FHWA | Federal Highway Administration
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| FTA | Federal Transit Administration
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| LRTP | long-range transportation plan
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| MAG | Mountain Land Association of Governments
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| MPO | metropolitan planning organization
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| SAFETEA-LU | Safe Accountable Efficient Transportation Equity Act: A Legacy for Users
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| TEA-21 | Transportation Equity Act for the 21st Century
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| TIP | Transportation Improvement Program
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| WFRC | Wasatch Front Regional Council
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