CE 2710 2014 Quiz 2 Study Guide

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CE 2710 Quiz 2 Study Guide

Spring 2014

Transportation Forecasting

Overview a.

What is the 4-step process and what is it used for? b.

What are the steps and the purpose of each of the 4 steps?

Trip Generation (Quiz 1 not on Quiz 2) a.

What is the purpose of trip generation? b.

Know the format of the cross-classification TG model c.

Know in very general terms the procedure used to get a TG model? d.

Know what land use and socio-economic factors are generally considered? e.

Know why is it necessary to consider land use and socio-economic factors? f.

Know how to use the cross-classification TG model to calculate number of trips from a TAZ g.

Understand the potential sources of error in the TG process

Trip Rate Analysis (Quiz 1 not on Quiz 2) a.

Know how to use tables and rate to estimate trip making for small projects b.

Understand the main shortcomings of the ITE procedure for estimating the number of trips c.

Understand some of the specific factors that cause the ITE process to over estimate trips in an urban, mixed use context

Trip Distribution a.

What is it? b.

Describe gravity model - the parameters and the meaning of the parameters c.

Know how to use gravity model to get trip interchange d.

Have an overview of how the gravity model is calibrated and the variables affected by calibration e.

Know the limitations of the gravity model

Modal Split a.

What is it? b.

What is a utility function? c.

Know the parameters in the utility function d.

Know how factors such as comfort and image are considered in the model e.

Know how to use the utility function and logit model to get modal split

Trip Assignment a.

What is it? b.

Know how the network is represented? c.

Know how to interpret network graph and link array

d.

Know what a tree diagram is e.

Know how to determine tree diagram from network graph or link array f.

Know how to interpret a tree table g.

Know the meaning of the term ‘all-or-nothing’ assignment h.

Know how to use tree diagram and 'all-or-nothing' assignment to assign trips to links

Traffic Flow

a.

Know and understand the relationship between i) spacing and concentration, ii) headway and flow b.

Know the definition and equation for determining time-mean-speed and space-mean-speed c.

Know how to construct and use the time-distance diagram to get spacing, headway, flow, concentration and speed d.

Understand how the time-distance diagram changes with speed e.

Know the relationships between flow, speed and concentration f.

Know the general shape of the speed-concentration, speed-flow and flowconcentration diagrams g.

Understand why slower speeds might result in higher flow h.

Understand the concept of a shock wave – how it forms and under what condition i.

Know the procedure and formulas to analyze the propagation or dissipation of shock waves

Traffic Data and Capacity

a.

What are some uses of travel flow data b.

What types of temporal variations are expected in travel flow data c.

What is directional distribution and what is the cause? (What other types of spatial variations might be expected in travel flow data?) d.

Explain why extreme temporal variation and spatial variation result in an inefficient use of transportation services and facilities e.

Understand some of the planning solutions for reducing the effects of temporal and spatial variations in travel f.

Know the definition of AADT g.

Know the basics of how the state collects data to calculate AADT h.

Know why AADT is not sufficient information on which to base design decisions i.

Know how a design hour is selected and the trade-off involved in choosing a design hour j.

Know how to estimate the Design Hour Volume in the design direction from the AADT k.

Understand the concept of Level of Service its relationship to capacity l.

Know the trade-off involved with using different LOS

m.

Understand the problems associated with 'predict and provide' planning

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