Lec 20 ch 11 transportation planning process objectives
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Lec 20, Ch.11: Transportation Planning Process (objectives). Understand how decisions to build transportation facilities are made Understand basic elements of the transportation planning process

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Lec 20 ch 11 transportation planning process objectives
Lec 20, Ch.11: Transportation Planning Process (objectives)

  • Understand how decisions to build transportation facilities are made

  • Understand basic elements of the transportation planning process

  • Understand basic elements of travel forecasting (This topic will be discussed in detail in CE565, winter semester. CE361 is the only prerequisite for CE565 according to the course catalog, but I recommend you to take CE370 (old) or CE470 (new) before you enroll in CE565.)


What we cover in class today
What we cover in class today…

  • Basic elements of transportation planning (This concept applies to any transportation planning including urban transportation planning, pp.509-514)

  • Urban transportation forecasting process

  • Four-step travel demand forecasting – A general introduction


The transportation planning process
The transportation planning process

  • It has become “institutionalized,” meaning federal guide guidelines, regulations, and requirements for local planning are often driving forces behind existing planning methods. Have you heard of MPOs (metropolitan planning organizations) like the Mountain Land of Governmentsor the Wasatch Front Regional Council? Or, have you heard of Envision Utah?

  • It is intended to furnish unbiased information about the effects that the proposed transportation project will have on the community and on its expected users.

  • It is intended to give the appropriate information to those who will be responsible for deciding whether the transportation project should go forward.



Example 11 1 planning the relocation of a rural road simple yet good enough to explain the steps
Example 11-1: Planning the relocation of a rural road (simple, yet good enough to explain the steps…)

  • Step 1: Situation definition:

  • to understand the situation that gave rise to the perceived need for a transportation improvement


Step 2 problem definition
Step 2: Problem definition (simple, yet good enough to explain the steps…)

Purpose of the step: Describe the problem in terms of the objectives to be accomplished and translate those objectives into criteria.

  • Example:

  • Objective = Statements of purpose: Reduce traffic congestion, Improve safety, Maximize net highway-user benefits, etc.

  • Criteria = Measures of effectiveness: Travel time, accident rate, delays (interested in reductions in these MOEs)


Step 3 search for solutions
Step 3: Search for solutions (simple, yet good enough to explain the steps…)

Brainstorm options at this stage.


Step 4 analysis of performance

Step 4: Analysis of performance


Step 4 cont ranking of alternatives in terms of moe
Step 4: (cont) Ranking of alternatives (in terms of MOE) perform under present and future conditions.


Step 5 evaluation of alternatives

Improves this way perform under present and future conditions.

Improves this way

Step 5: Evaluation of alternatives

  • Determine how well each alternative will achieve the objectives of the project as defined by the criteria.

Cost-wise best

This is a multi-objective evaluation problem.

Improvement-wise superior


Step 6 choice of project
Step 6: Choice of project perform under present and future conditions.

  • Based on the alternative evaluation in Step 5, we will choose the best alternative for design and eventual construction. The best choice may not be built because of opposition by the people of the community that is affected.

Step 7: Specification and construction

  • Once the project has been chosen, a detailed design phase is begun, in which each of the components of the facility is specified.


Urban transportation demand forecasting process
Urban transportation (demand) forecasting process perform under present and future conditions.

  • This task is a technical effort to analyze the performance of various alternatives. We must define the study area first. Then further subdivide the area into traffic (analysis) zone, TAZ, for data tabulation and analysis.

  • Homogeneous socioeconomic characteristics: e.g., high-income residential

  • Minimum intra-zonal trips

  • Use of physical, political, and historical boundaries, where possible

  • Zones, once created, should not be subdivided into smaller zones during analysis

  • Zones generating and attracting approximately equal trips, households, population, or area

  • Use of census tract boundaries, where possible (easier to collect data from the Census Bureau’s publications)


Travel demand model flowchart
Travel demand model flowchart perform under present and future conditions.




Link node map for highway system
Link-node map for highway system process

  • Link-node maps are the starting point for the 4-step transportation demand forecasting process


4 step transportation demand forecasting process
4-step transportation demand forecasting process process

  • Preparation: population and economic analysis and land use analysis


Graphical way of understanding the 4 step demand forecasting process
Graphical way of understanding the 4-step demand forecasting process

200 trips from zone 46 to zone 29

1000 trips attracted

1000 trips generated

70% this route

Auto total: 95%

Public transit: 5%

25% this route