SystemManagement

Network

Environment

VehicleCharacteristics

TravelerCharacteristics

System Traveler

Influencing Factors

• Traveler: traveler characteristics, vehicle characteristics

• System: network, environment, system management

• Of interest only as related to behavioral inputs and outputs

• Behavioral Algorithms– Define traveler behavior within the core model

• Influencing Factors– Components of the system, which influence traveler behavior

– Used as vehicle for soliciting stakeholder input

• System State– Time-specific interaction mechanisms of traffic components and

traveler behaviors

* See following pages for details

Simulation Model Framework

Influencing Factors

Scenarios

Definition: A set of influencing factors, which a user wants to model, independent of the state of traffic on the system.

This workshop uses scenarios as means of identifying requirements of simulation models. It makes the assumption that most users think about their model needs in terms of modeling specific scenarios, which are defined by sets of influencing factors. Three examples of scenarios are attached.

Participants should attempt to describe scenarios using the influencing factor categories described in the following pages. Each category contains room to add relevant factors.

The objectives of this exercise are:• To identify scenarios/situations that are the most common problem areas for users• To identify existing data sets that can be used to develop and validate algorithms that can accurately represent traffic conditions• To identify available algorithms that address the identified problem areas

Instructions

Situations

Definition: A set of influencing factors, which a user wants to model, including the state of traffic on the system.

A scenario contains many situations of potential interest. This workshop uses situations as a means of understanding different system states of a scenario which may be challenging to model.

The ability to…Represent reduced system-wide visibility due to weather (e.g. fog)Represent localized visibility reductions due to weatherRepresent reduced system-wide surface quality due to weather (e.g. ice)Represent localized surface quality due to weatherRepresent other vehicle weather control effects (e.g. wind)Represent temporary lane closures due to incidents or eventsRepresent localized visual distractionsRepresent localized aural distractions

Weather

Incidents

Other

En

vir

on

me

nt

The ability to…Model high demand conditionsModel low demand conditionsModel freewaysModel local and arterial streetsModel rural roadsModel on-ramps and off-rampsModel parking areasModel non-motorized networks (pedestrian, bicycle)Model transit networksModel geometries of links (e.g. curb cuts)Model lane characteristics (e.g. mid-link adds and drops)Model lane widthsModel median characteristics (e.g. breaks, geometries)Model shoulder characteristics (e.g. geometry, surface, access)Model grade changesModel link elevationModel pavement quality effectsModel contra-flow lanesModel auxiliary lanesModel signalized intersectionsModel unsignalized intersectionsModel roundaboutsModel toll plazasModel rail/highway crossingsModel freeway-to-arterial interchanges (diamond, SPUI, loops)Model freeway-to-freeway interchangesModel approach geometries and connectivityModel detailed junction geometries (e.g. curb cuts)Model turn restrictionsModel the location and visibility of control devicesModel traffic calming measures and other flow limiting characteristicsModel center link markings (e.g. passing restrictions)Model curb markings (e.g. parking restrictions)Model link use restrictions by cost (e.g. HOT)Model link use restrictions by vehicle type (e.g. HOV)Model the location and functionality of detection devices

Other

Net

wo

rk

Link Types

Link Characteristics

Junction Types

Junction Characteristics

Traffic Control Devices (Signs and Pavement

Markings)

Demand

The ability to…Model visual acuity of travelersModel attentiveness of travelersModel familiarity of travelers with the travel networkModel aggressiveness of travelersModel the time value of money of travelersModel driving skill of travelersModel driver impairmentT

rav

ele

r

Control

Decision Making

Perception

Other

The ability to…Model different types of passenger vehiclesModel different types of commercial vehiclesModel different types of transit vehiclesModel different types of non-motorized vehicles and pedestriansAdequately express vehicle dimensionsAdequately represent articulated vehicle sectionsAdequately represent vehicle massAdequately represent passenger capacityAdequately represent acceleration and decelerationModel and represent turning radiiModel vehicle route restrictions (e.g. transit)

Ve

hic

le

Other

Dynamic

Physical

Type

The ability to…Model actuated signalsModel emergency vehicle signal preemptionModel transit vehicle signal priorities

Freeway Model ramp meteringModel dynamic route modificationModel dynamic schedule modification

Incident Model incident detection, verification, response and managementEmergency Model dynamic emergency vehicle routing

Model junction-based electronic toll collection (i.e. at a toll plaza)Model zone-based electronic toll collection (e.g. congestion pricing)Model electronic transit fare paymentModel broadcast traveler information (e.g. HAR)Model broadcast traveler route guidanceModel location-based traveler information (e.g. VMS)Model location-based route guidanceModel electronic screening, weighing, clearance.Model hazardous materials response

Sy

ste

m M

an

ag

em

en

tArterial

Management

Advanced Transit

Electronic Payment

Regional Multimodal

Traveler InformationCommercial

Vehicle

Other