Transportation Planning and Modeling Transportation planning is a field involved with the evaluation, assessment, design and siting of transportation facilities (generally streets, highways, footpaths, bike lanes and public transport lines). – Wikipedia, Aug 29, 2010 Image: public domaintransportationstreetshighwaysfootpathspublic transport

Rational Planning Method –defining goals and objectives, –identifying problems, –generating alternatives, –evaluating alternatives, and –developing plans Image: GNU Free Documentation License Daniel SchwenDaniel Schwen, the copyright holder

Des Moines MPO

Planning Options Short run –TSM –TDM –Access Mgmt. –Congestion Mgmt. Long Run –Construction –Land use Future? –Pricing –Technology (ITS, fuels)

Congestion Pricing Why we don’t use congestion pricing: anville-on-why-we-dont-use-congestion.html anville-on-why-we-dont-use-congestion.html

Travel demand modeling Evaluating alternatives requires –Estimated travel demand (trips) –Estimated trip lengths –Estimated modal shares –Estimated travel speeds –Estimated travel delays –Estimate air quality, noise and energy impacts Need a systematic process

“Four” step model optional sometimes omitted

Data collection Demographic/Socioeconomic Transportation system Travel behavior/propensity/desires –Surveys

Study area/zone slide Des Moines MPO Boundary

Zones (TAZs)

Travel Demand Modeling (Forecasting) What is travel “demand”? Three factors –Land use –Socioeconomics and demographics –Transportation services (TTYP name 3 characteristics of these factors that affect demand)

Trip Generation Determine number of “trip ends” Methods –Cross Classification (tables) –Rates based on activity units (ITE) –Regression

Trip Distribution Determine origin and destination of trips Methods –Gravity model (Need a good shortest path algorithm) –Growth factor models

Find the shortest path from node to all other nodes (from Garber and Hoel) 1 Yellow numbers represent link travel times in minutes 3

FINAL

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Mode Choice (Split) Which mode (transit, walk, carpool,drive alone, …) will be used? Methods –Direct generation –Trip end models –Trip interchange models

Traffic Assignment Which route will the trips take? Methods –Minimum path (distance or time) –Capacity restrained Need a good shortest path algorithm