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Transportation 1
Exam 1
| Term | Definition |
|---|---|
| Accessibility | the ability to reach a destination with reasonable effort or cost |
| Destination | place where a trip ends |
| Origin | place where a trip begins |
| Intermodal transfer points | places where there is a change of mode |
| 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) |
| Line haul | one segment of a trip |
| Mobility | the ability to make trips |
| Mode | The form of transport – highway, air, carpool |
| Primary data | Data collected directly by the analyst |
| Secondary data | Data borrowed from other places or from previous activities in the same place |
| 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. |
| 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 |
| Capacity | The amount of goods and/or persons a system can handle before reaching saturation. |
| Classification | the process of breaking down the total number of vehicles observed into categories or classes |
| Density | A measure of traffic congestion, the number of vehicles per unit length of a roadway |
| Design Hourly Volume (DHV) | The hourly volume used by roadway designers to determine the capacity needed |
| Free-flow speed | Speed that can be maintained on a given roadway when no other vehicles are present |
| Gap | The space between consecutive vehicles, rear bumper to front bumper |
| Headway | Time or distance between consecutive vehicles |
| Jam Density (Dj) | The maximum possible density on a roadway |
| K-factor | the proportion of daily traffic at a site that occurs during the peak period |
| Level of Service (LOS) | a letter designation that describes a range of operating conditions on a particular type of facility. |
| Occupancy | The percent of time in which a point in the roadway has a vehicle that is directly over it. |
| 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. |
| Space mean speed (SMS) | The average speed of all vehicles moving over a given section of a highway over some specified time period |
| Time mean speed (TMS) | The average speed of all vehicles passing a point on a highway over some specified time period |
| Traffic counts – (volume) | the number of vehicles that pass a point during a specified time period |
| 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! |
| 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 |
| Freeway | a divided highway that provides uninterrupted flow |
| Derived demand | The recognition that a trip is made because of the activities to be undertaken at the end of the trip. |
| Modal Split | Determines which mode of transportation will be used to make the trip |
| Peak hour of the generator | The 60-min. period in which the highest volume entering and leaving the site occurs |
| 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.) |
| Peak-hour trips | The total number of vehicular trips to and from a site during a 60-min period |
| Traffic Analysis Zone (TAS) | A geographic subset of a study area |
| Trip assignment | A procedure by which traveler route choice in a street or highway network is simulated |
| Trip distribution | A procedure to describe and explain how travelers choose their destinations |
| Trip generation | A procedure to estimate how many trips are made to and from certain locations, such as households, individual sites, or TAZs |
| 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 |
| Programming | used to describe the selection and scheduling of projects |
| Stakeholder | a person, a group of persons, a company, or an organization that has a stake in the decisions being made |
| FHWA | Federal Highway Administration |
| FTA | Federal Transit Administration |
| LRTP | long-range transportation plan |
| MAG | Mountain Land Association of Governments |
| MPO | metropolitan planning organization |
| SAFETEA-LU | Safe Accountable Efficient Transportation Equity Act: A Legacy for Users |
| TEA-21 | Transportation Equity Act for the 21st Century |
| TIP | Transportation Improvement Program |
| WFRC | Wasatch Front Regional Council |
Created by:
ryanwoods7
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