D

daily vehicle inspections (DVI)

Checklist inspection operators must complete each day before using a vehicle to determine if it's roadworthy.

Completing a DVI is required to meet hours of service and government compliance regulations.

data communication

Ability to send written messages and information between dispatchers and operators, reducing the amount of voice communication.

data message

Digital information (data) exchanged between mobile units and the dispatch center.

Each message has an assigned message type and subtypes (as applicable).

Data Services

Windows service that provides the primary means of communication for mapping, API, MobileFocus, and advanced indexing for EAM.

Days of Operation

(Used in UK) See service.

deadhead

  1. A run traveling without passengers (empty) from one stop to another, from the garage to the first stop, or to the garage from the last stop.
  2. Non-revenue travel by a vehicle, often between routes (interline) or pull-out/pull-in for fixed route vehicles.

    This doesn't include hours for training runs prior to revenue service, maintenance tests, school bus services, and charter services.

    See also non-revenue service and exempt service.

default workspace

Shared workspace used to make sure all employees work within the same layout.

Default workspaces are useful when trying to resolve issues with Trapeze Customer Care and when training new users. No matter how private workspaces are changed, all workspace components can be retrieved using the default workspace.

Only system administrators can change a default workspace.

See also workspace.

defect card

Report of vehicle behavior operators supply to transit maintenance after a run.

deleted stop

Status of a bus stop in use.

Deleted status is an attribute recorded in Bus Stop Manager.

A deleted bus stop is no longer tracked for work and maintenance, but the record for it exists in Bus Stop Manager for historical purposes.

See also active.

demand response

Door-to-door service where trips are booked by transit agency clients to accommodate their individual needs.

Multiple clients may ride a vehicle at any given time. This is in contrast to fixed route service, where passengers travel to specific locations using generically available transit options.

detail view

Part of a screen that shows fields of information.

Detail view is typically accessed by selecting a record in list view.

Also called form view.

See also list view.

diagnostic tools

  1. System that monitors vehicle maintenance and alerts users to maintenance issues (for example, low tire pressure).

    It can help reduce costly repairs, save gas, and minimize repair downtime.

  2. Software tools that assist in system troubleshooting.

Differential Global Positioning System (DGPS)

System that works to correct errors in GPS using a high-performance GPS receiver at a known location (called a reference station).

Error data for each tracked satellite is formatted into a correction message and transmitted to the GPS users (the vehicles) over the digital radio network. DGPS technology removes most of the satellite signal error and improves accuracy to about one meter.

Direct Travel Time (DTT)

Estimated duration of a trip from an origin to a destination without any stops or delays.

dispatch

  1. Administration of service irregularities and schedule modifications that occur after log sheets have been printed for specific dates.
  2. Shorter name for dispatch control center.

    See also dispatch control center.

dispatcher

Person who performs daily dispatching tasks. For example, recording employee absences, canceling trips, and communicating with employees.

Dispatcher tasks vary depending on transit agency policies and the Trapeze product used (for example, OPS or PASS).

double-booking

Two or more bookings for a single client with conflicting trip times.

It is possible to have multiple bookings for one client in a single day provided that they do not overlap one another.

drill

Method for working with data to see related information. Typically used in ViewPoint.
drill down
Moving down one level in the data hierarchy.
drill through
Action of selecting data in a visual to show a relevant report with the related data highlighted.
drill up
Moving up one level in the data hierarchy.

driver behavior monitoring

Process of using engine information to track unsafe or wasteful operator behaviors. For example, speeding, idling, harsh braking, or excessive acceleration.

driver manifest

Itinerary of events to be performed for a specific run by a specific driver on a single day. Typically used in demand response work.

driver paddle

Daily itinerary of work performed by an operator.

The driver paddle includes report time and garages, all trips and times and special comments such as layover time and location, breaks, lunch, travels, relief time and location, and deadhead times and routes. Typically used in fixed route work.

Also called paddle report.

See also block paddle.

drop back

When a train operator is left at a station while the rail service continues (with another operator).

A drop back lets transfers, driver relief, or breaks take place without disrupting the overall service. Typically, operators have a brief layover period and then take over the next train that passes through the station.

Also called step backs.

duty

(Used in UK) See run.

dwell time

Period of time a public transit vehicle spends, or should spend, in a station or at a stop from the moment of stopping to the moment of restarting. It includes door opening, passenger loading, passenger unloading, and door closure.