PRE-LOADED DATA.  TREDIS comes pre-loaded with an extensive database of information on current characteristics of your study area(s) and modes. This includes:

-> Economy - baseline measures

• mix of employment, wages, value added (GDP), and income, by industry
• domestic and international import, export and internal shipments, by commodity
• indicators of relative cost of doing business - labor, electricity, land/building values
• forecast (year-to-year change in employment and income by industry  (option from Moody's Economy.com)

-> Market Access and Connectivity - baseline measures

• scale of labor and retail markets (population within 40 minute travel time)
• scale of same day truck delivery market (employment within 3-hour travel time)
• average road access time to commercial airports with scheduled domestic air service
• average road access time to commercial marine ports with scheduled freight service
• average road access time to public intermodal rail terminal
• average road access time to major international gateway airport

-> Unit Values - may be split by mode and/or trip purpose

• Unit value of passenger time savings (per traveler by mode)
• Unit value of vehicle operating cost savings (avg. per vehicle-mile or vehicle-hr)
• Unit value of cargo time savings (per ton, by mode and commodity class)
• Unit value of crash reduction (by type: mortality, injury, property damage)
• Unit value of emissions reduction (user supplied or average per vehicle-mile)
• Reliability Factors (congestion rating factor, logistics cost factor)
• Business Productivity (effective density/agglomeration scale factors)

USER INPUTS.  All that is needed to run TREDIS is a scenario that represents some change in travel characteristics, defined in terms of at least one of the following items

-> Available Modes - sub-modes may be defined as desired (examples in parentheses)

• Cars (may split by trip purpose: work, commute or personal):
• Trucks (may split delivery vans, light trucks, heavy trucks, multiple trailer, etc.) 
• Transit (may split by trip purpose or sub-mode: van, regular bus, BRT, light rail, etc.)
• Rail (may split freight, commuter rail, inter-city passenger, high speed rail, etc.) 
• Marine (may split passenger ferry, car ferry, barge, freighter, cruise ship, etc.)
• Air (may split general aviation, air taxi/charter, freight, prop, regional jets, full size commercial airliners, jumbo jets, etc.),

-> Modal Characteristics -  (change) for each available mode:

• Avg. Vehicle occupancy (passengers)
• Avg. Driver/crew size (commercial services)
• Avg. Cargo carried (tons)
• Avg. fare, toll, road user fee or freight fee
• Cargo mix (default or user-selected commodity mix)
• Operating costs/mile (or per km)
• Fuel economy (miles/gallon or per liter)
• Emission rates (various pollutants and CO, per mile or per km)

-> Traffic Characteristics - (change) may be split by mode, vehicle class, trip purpose, time period:

• Volume, speed or average trip distance
• Baseline traffic growth rate (annual rate)
• VMT vehicle miles traveled (or VKT vehicle kilometers traveled)
• VHT vehicle hours traveled
• Congestion levels (volume/capacity ratio, or percent of major routes congested)
• Reliability (time variability or buffer time)
• Safety (accident rates: mortality, injury, property damage)
• Induced travel

-> Origin/Destination Patterns - may be split by mode, vehicle class, trip purpose, time period:

• Fraction of trips internal to study area (local origin and destination)
• Fraction of trips with coming into the study area (outside origin, local destination)
• Fraction of trips leaving the study area (local origin, outside destination)
• Fraction of trips passing through the study area (outside origin and destination)

-> Access Characteristics (change) - for each county in the study area:

• Size of labor and shopper markets (population within 40 minute travel time)
• Size of same day truck delivery market (employment within 3-hour travel time)
• Average road access time to commercial airports (and activity scale of the airport)
• Average road access time to marine port
• Average road access time to an intermodal rail terminal
• Average road access time to international gateway airport

-> Policy, Program or Project Attributes (change) - may be split by mode, vehicle class, time period:

• Regulation or Restrictions on Use of Facility or Equipment (e.g., truck lanes, carpool lanes, bridge weight limits, airport runway limits, port vessel size limits)
• Charges for Use of Facility or Equipment: Tolls, Taxes, Fees (per vehicle, per trip, per mile, or per fuel unit; for specific facilities or areas)
• Cost of Constructing or Reconstructing Facility & Purchasing Equipment  (total, over time, by type) 
• Cost of Operating Facility & Equipment (total, allocation over time, budget elements)
• Public/private partnership roles (finance, operation, revenue collection)
• Contingent development (dependent on transport access investment)