PLAN203 Lecture Notes - Lecture 7: Transportation Planning, Graph Theory, Dependent And Independent Variables
6 Jun 2016
School
Department
Course
Professor
Document Summary
Week 4: forecasting models data needs and collection. Models in transportation: models of the physical transport system are a prominent part of transportation planning tool kit, abstractions of reality that serve many roles. Types of models: diagrams 2d, elevations, x-sections, physical models (constructed, virtual models (sketch up, data models (mathematical): system relationships, gis models - spatial component featured, framework models. Diagram models: consider flows of traffic, modes of transportation, # lanes, auto and bicycle, auto, pedestrian, bicycle counts, directions of travel. Examples: determine relationship between size of facility (by employment) and truck traffic generated. , determine the likelihood of choosing more sustainable mode based on trip length. Capacity (c) the maximum number of units processed in a unit of time (design, constructed limit) e. g. people/hr, vehicles/day, vehicles/hour vehicles/hour/ per lane, containers/hour: applied to links, nodes, equipment. Throughput (q) is the actual flow or volume of units in a given time (what we measure - reality)
