Bus Companies Industry Terminology

ADA (Americans with Disabilities Act)

US civil rights law that requires accessible public transportation, including features like wheelchair ramps or lifts, priority seating, securement devices, stop announcements, and complementary paratransit within 3/4 mile of fixed routes during the same days and hours.

- We must ensure all new buses meet ADA accessibility standards, including ramps and securement systems. - The scheduler added time for ADA boardings at key stops. - Our ADA complementary paratransit service mirrors fixed-route hours within the 3/4-mile corridor.

APC (Automatic Passenger Counter)

Sensors installed on doors to count boardings and alightings, producing detailed ridership and load profiles for planning, scheduling, and performance analysis.

- APC data showed heavy PM peak loads on Route 10, prompting a frequency increase. - We ran ride checks to calibrate the APCs for accuracy. - APC analytics informed a stop consolidation plan to reduce dwell time.

AVL (Automatic Vehicle Location)

GPS-based systems that track bus locations in real time for operations control, customer information, service monitoring, and historical analysis.

- Dispatch uses AVL to manage headways and respond to bunching. - The rider app displays real-time arrivals sourced from AVL. - AVL exceptions flagged a long layover beyond schedule at the terminal.

BEB (Battery Electric Bus)

A transit or motorcoach vehicle powered solely by onboard batteries, charged via plug-in or overhead systems; valued for zero tailpipe emissions and quieter operation but requires charging strategy and range management.

- The BEB fleet targets 180 miles of range on a full charge in mixed duty cycles. - We optimized block lengths to fit BEB SOC constraints. - Depot charging was sized to turn the BEBs overnight at 150 kW per bus.

Block (Vehicle Block)

A sequence of scheduled trips assigned to a single vehicle for a day, including revenue trips, pull-outs, layovers, and pull-ins.

- Block 1203 interlines from Route 7 to Route 19 after 14:00. - Road calls disrupt multiple trips when they take down an entire block. - The run-cutting process assigns operator work to cover each block.

BRT (Bus Rapid Transit)

A high-capacity bus service with features like dedicated lanes, signal priority, consolidated stations, off-board payment, and frequent service to deliver rail-like speed and reliability.

- The BRT design includes dedicated lanes, TSP, and off-board fare collection. - BRT stations provide platform-level boarding and real-time information. - Converting the corridor to BRT cut end-to-end travel time by 25%.

Bunching

When buses on the same route end up running closely together due to variability, causing gaps and unreliability; managed with control strategies like holding, short turns, and headway management.

- We introduced headway-based control to reduce bunching on frequent routes. - Dwell time spikes at busy stops triggered bunching in the PM peak. - Supervisors used holding at timepoints to break up bunching.

CDL (Commercial Driver’s License)

A specialized driver license required to operate commercial passenger vehicles; typically Class B for transit and motorcoach, with passenger (P) and air brake endorsements.

- New hires must hold a Class B CDL with passenger and air brake endorsements. - The school bus division requires the S endorsement in addition to the CDL. - We sponsor CDL training to address the operator shortage.

Contracting Models (Gross Cost vs Net Cost)

Two principal ways authorities procure bus operations: gross cost (agency pays fixed rate, keeps fares) and net cost (operator keeps fare revenue and bears revenue risk), each with different incentives and risk allocations.

- Under the gross cost contract the agency retains fare revenue and revenue risk. - Net cost bids were lower but shifted ridership risk to the operator. - The RFP allows both gross and net cost options by route group.

Cutaway Bus

A smaller bus built on a van or light truck chassis, commonly used for paratransit, shuttles, and lower-demand routes.

- Paratransit runs mostly on cutaways built on E-450 chassis. - Cutaways have lower acquisition costs but shorter lifespans than heavy-duty buses. - We spec’d wider doors on cutaways to speed wheelchair boarding.

Deadhead (Dead Mileage)

Non-revenue movement of a bus, such as from depot to first stop or between trips, not open to passengers.

- We cut deadhead by moving pull-outs to the closer depot. - Deadhead miles are excluded from VRH productivity metrics. - Construction forced a detour that increased deadhead time by 8 minutes.

Demand-Responsive Transit (DRT) and Microtransit

Shared, on-demand services that match riders to vehicles in real time within defined zones, often booked via app or call center, complementing fixed routes in low-density or off-peak contexts.

- The microtransit zone provides curb-to-curb service with dynamic routing. - DRT replaced low-productivity fixed routes in the late evening. - We set a 15-minute average ETA target for the DRT pilot.

Depot Charging

Charging BEBs at maintenance depots, typically overnight with AC or DC fast chargers, emphasizing energy management, layout, and utility coordination.

- Overnight depot charging returns BEBs to 90% SOC by 5 AM pull-out. - We modeled demand charges to size depot chargers cost-effectively. - The depot layout was redesigned to accommodate charger pedestals and cable management.

Dwell Time

Time a bus spends stopped to board and alight passengers; influenced by fare payment method, passenger volumes, vehicle design, and stop layout.

- All-door boarding cut dwell time at busy stops by 30%. - High cash usage increases dwell time and hurts OTP. - Longer platforms reduce dwell by spreading passenger loading.

ELD (Electronic Logging Device)

A device that electronically records driver duty status and driving time to comply with Hours of Service regulations for passenger-carrying commercial vehicles.

- Our motorcoach division uses ELDs to comply with HOS rules. - ELD reports flagged a risk of exceeding the 15-hour on-duty limit. - Safety audits require ELD data retention and review.

Fare Capping

A pricing policy where riders automatically stop paying once they reach the cost of a pass (daily, weekly, or monthly) through accumulated fares.

- With fare capping, riders never pay more than the day pass price. - Account-based ticketing enabled weekly fare caps across products. - Fare capping increased equity by removing prepayment barriers.

Farebox Recovery Ratio

The share of operating costs covered by passenger fare revenue, used to assess financial performance at route or system level.

- The board set a target farebox recovery ratio of 20%. - Express routes have higher recovery compared to locals. - COVID-era declines pushed farebox recovery to historic lows.

FCEB (Fuel Cell Electric Bus)

A zero-emission bus powered by electricity from a hydrogen fuel cell, refueled with hydrogen rather than charged from the grid.

- FCEBs offer longer range and fast refueling versus BEBs on long blocks. - The hydrogen station was sized for 20 FCEBs with redundancy. - Winter range testing favored FCEBs on our hilly, cold routes.

GTFS (General Transit Feed Specification)

An open data format for scheduled transit service (routes, trips, stops, calendars), enabling journey planners and public data sharing.

- Publishing GTFS improved trip planning across third-party apps. - The feed’s stop_times and shapes were validated before release. - We added route branding fields to the GTFS for BRT lines.

GTFS Realtime (GTFS-RT)

A companion standard to GTFS that publishes live vehicle positions, trip updates, and service alerts.

- Vehicle positions and trip updates power our real-time arrival predictions. - GTFS-RT service alerts inform riders of detours and cancellations. - The agency’s CAD/AVL system feeds GTFS-RT to apps every 15 seconds.

Headway

The time interval between consecutive buses on the same route and direction; a key measure for frequent service.

- The route runs an 8-minute headway at the peak. - We managed headways instead of strict schedules on high-frequency corridors. - Excessive variability produced wide headway gaps and crowding.

Hours of Service (HOS)

FMCSA regulations limiting driving and on-duty time for passenger-carrying commercial drivers (e.g., motorcoach), intended to prevent fatigue and improve safety.

- The scheduler built runs to respect HOS limits for charter work. - ELD data confirmed compliance with 7-day and daily HOS caps. - Relief points help operators stay within HOS constraints.

Intercity Bus (Over-the-Road Bus)

Long-distance scheduled bus service connecting cities and regions, often using motorcoaches designed for highway travel and luggage handling.

- Intercity operators coordinate schedules for timed connections. - OTRB fleets emphasize comfort features like recliners and onboard restrooms. - FMCSA oversight applies to these interstate services.

Interlining

Operational practice where a vehicle continues from one route or trip to another without returning to the depot, improving efficiency and resource use.

- Interlining reduced terminal layover needs by 15%. - The same bus interlines from Route 4 to Route 12 every hour. - Interlining improves fleet utilization but complicates recovery from delays.

Kneeling Bus

A bus with suspension that lowers the boarding side to reduce step height and ease boarding, especially helpful for seniors and riders with mobility devices.

- Operators kneel the bus at curbside to improve accessibility. - Training emphasizes using kneeling plus ramp deployment when needed. - Kneeling reduced fall incidents during boarding.

Layover

Time at the end of a trip or route where the bus is out of service for recovery and operator breaks before starting the next trip.

- We added a 5-minute layover for schedule recovery at the terminal. - Operator breaks are scheduled during layovers. - Excess layover time inflates cycle times and costs.

Load Factor

A measure of passenger occupancy relative to capacity (e.g., seated or crush capacity), used to evaluate crowding and right-size service.

- Average load factor exceeded 1.0 on Route 22 in the peak, indicating standees. - We target a max load factor of 1.2 on locals. - Load factor thresholds trigger capacity boosts or larger buses.

Low-Floor Bus

A bus with a low interior floor and minimal steps, enabling easier, faster boarding and better accessibility.

- Low-floor designs allow ramp boarding instead of lifts. - We specified two-door low-floor buses for faster alighting. - Low-floor buses shortened dwell times at busy stops.

MaaS (Mobility as a Service)

Digital integration of multiple transport modes into a single platform for trip planning, booking, and payment to provide seamless mobility.

- The city’s MaaS app integrates bus, bikeshare, and ride-hail payments. - MaaS partnerships helped first-mile/last-mile connections to BRT. - MaaS requires account-based fare systems and open APIs.

MDBF (Mean Distance Between Failures)

Reliability metric indicating average miles between chargeable mechanical failures that delay service.

- The BEB fleet achieved an MDBF of 18,000 miles this quarter. - MDBF trends inform warranty claims with OEMs. - Raising MDBF reduces road calls and service disruptions.

NTD (National Transit Database)

US FTA database where transit agencies report service, financial, asset, and safety data, used for benchmarking and funding apportionment.

- We report VRH, VRM, ridership, and safety events to the NTD annually. - NTD submissions affect federal formula funding. - Audits verified the accuracy of our NTD cost allocations.

On-Route Charging

Opportunity charging during the day at stops or terminals using high-power overhead or conductive systems to extend BEB range.

- Opp-chargers at terminals top up batteries during layovers. - On-route charging enabled 24-hour service with fewer BEBs. - We selected pantograph-down hardware for interoperability.

On-Time Performance (OTP)

Share of trips or timepoints that meet schedule adherence tolerances; a core reliability KPI.

- OTP improved after adding recovery time and TSP at signals. - The agency defines on time as no more than 1 minute early and 5 minutes late. - OTP dashboards highlight chronic delay hotspots.

Operator Shortage

Industry-wide challenge in recruiting and retaining bus operators, influenced by labor market, compensation, working conditions, and CDL requirements.

- The operator shortage forced temporary service reductions. - We launched a CDL training pipeline with hiring bonuses. - Schedule redesign reduced split shifts to improve retention.

Paratransit (ADA Complementary)

Door-to-door or curb-to-curb service for riders whose disabilities prevent using fixed routes, required within 3/4 mile of fixed routes during the same hours.

- ADA paratransit must provide next-day reservations within the service corridor. - Eligibility assessments ensure the service is reserved for qualified riders. - Brokers help manage paratransit demand and costs.

Preventive Maintenance (PM)

Scheduled inspections and servicing (fluids, filters, brakes, HVAC, HV batteries) to keep buses reliable, extend asset life, and ensure safety compliance.

- The fleet follows A-B-C PM intervals at mileage and time thresholds. - Strong PM practices improved MDBF and reduced road calls. - FTA requires PM documentation for grant eligibility.

Proof-of-Payment (POP)

Fare control system where riders validate or buy before boarding and must show proof upon inspection, replacing onboard fare gates or front-door payment.

- POP with all-door boarding cut dwell times significantly. - Fare inspectors check tickets randomly to deter evasion. - POP requires clear signage and accessible validators.

Pull-in/Pull-out

Movements when vehicles leave the depot to start service (pull-out) and return after finishing (pull-in); often tracked separately from revenue service.

- Pull-out is at 05:12 from the East Depot; pull-in at 23:40. - We moved storage to cut pull-out deadhead by 10 minutes. - Operator pay includes travel time for certain pull-outs per the CBA.

Recovery Time (Schedule Padding)

Extra time built into schedules to absorb variability and restore on-time performance at terminals or timepoints.

- Adding 3 minutes of recovery at the terminal improved OTP. - Excessive padding makes schedules feel slow and costly. - We redistributed recovery time to match directional delays.

Road Call

An in-service mechanical failure requiring dispatch of maintenance support or a change-off bus.

- The road call team swapped buses after a door fault. - We track miles between road calls as a reliability KPI. - Frequent HVAC road calls suggested a preventive maintenance gap.

Run-Cutting

The process of turning vehicle blocks into operator work assignments (runs) that comply with labor agreements, breaks, and legal limits.

- Run-cutting balanced labor rules with minimizing split shifts. - The software produced runs with legal breaks and relief points. - A tighter run-cut saved overtime on weekends.

SOC (State of Charge)

Percentage of battery capacity remaining on an electric bus; critical for scheduling, charging, and range assurance.

- Dispatch held a bus to reach 80% SOC before pull-out. - We set a minimum SOC of 25% at end of block. - Real-time SOC feeds into our charge management system.

Spare Ratio

The proportion of buses above the peak service requirement kept available to cover maintenance and failures.

- The spare ratio is capped at 20% per FTA guidance for large fleets. - Low reliability forced a temporary increase in spares. - Fleet planning ties spare ratio to peak pull-out and maintenance needs.

TCO (Total Cost of Ownership)

Life-cycle cost view including purchase, financing, fuel or energy, maintenance, infrastructure, training, and residual value.

- TCO comparisons showed BEBs break even by year eight. - Infrastructure costs were included in the TCO for electrification. - Warranty terms materially affected the TCO model.

Timepoint

Designated stops where schedule times are published and adherence is measured; used for control and rider information.

- Operators cannot depart a timepoint early. - We added a timepoint at the hospital to anchor transfers. - Timepoint adherence is reported in the OTP dashboard.

Transfer

A rider’s change from one bus or route to another; also refers to fare rules that allow continuing trips without new charges within a time window.

- The fare system offers a 90-minute free transfer window. - Timed transfers at the transit center reduce wait times. - Interline design can eliminate some transfers for through riders.

Transit Signal Priority (TSP)

Traffic signal strategies (e.g., green extension, early green) that reduce delay for buses at intersections without fully preempting traffic.

- TSP cut corridor travel time by 8% through green extensions. - Bus detection uses GPS to request TSP at intersections. - We coupled TSP with queue jumps on the BRT corridor.

Vehicle Revenue Hours (VRH)

Hours when a bus is in service and available to carry passengers, excluding deadhead and layover beyond the published schedule.

- Boardings per VRH is a core productivity metric. - NTD reporting uses VRH to calculate service intensity. - Deadhead time is excluded from VRH calculations.

Wheelchair Ramp/Lift

Accessibility equipment enabling riders using wheelchairs or other mobility devices to board; ramps deploy on low-floor buses, lifts on high-floor vehicles.

- Low-floor buses use ramps; high-floor motorcoaches use lifts. - Operators secure mobility devices with Q'Straint systems. - Regular ramp cycle tests are part of PM.

Zone-Based Fare

A fare structure where prices vary by geographic zones crossed, commonly used for commuter and intercity services.

- The express network uses a zone-based fare with higher outer-zone prices. - We modeled fare equity impacts when adding a new zone. - Validators must capture tap-in and tap-out to price zones accurately.