HKIE Professional Assessment - Logistics & Transportation Discipline key terms

A letter grade from A to F describing traffic flow quality on a road or intersection, based on measures such as speed, density, delay or volume-to-capacity ratio. It is used to judge whether a design or existing facility performs acceptably.

A standardised analytical procedure for estimating capacity and level of service of freeways, highways, intersections and pedestrian facilities from traffic, geometric and control data. It underpins many junction and link design decisions and is periodically revised.

The maximum number of vehicles that can cross a stop line from a lane or lane group during one hour of green, assuming continuous queued demand. Signal timing and lane capacity calculations are built on this value.

A formula deriving signal cycle time that minimises average control delay from total lost time and critical flow ratios across phases. It gives a starting point for timing plans before practical constraints and pedestrian requirements are applied.

The traffic volume, usually the thirtieth highest hourly volume of the year, adopted for geometric design of a road. Using a high but not absolute peak volume balances construction cost against congestion on a few days.

The total two-way traffic volume passing a point over a year divided by 365. It is a basic exposure and trend measure used in planning, pavement design inputs and safety analysis rather than for peak-hour design.

A multiplicative estimate of the change in crash frequency expected after applying a countermeasure at a site, relative to what would otherwise have occurred. Values below one indicate fewer crashes and support economic appraisal of safety schemes.

An independent, formal examination of a road scheme or existing road by a qualified team, identifying hazards and suggesting mitigation before crashes occur. It is distinct from crash investigation, which studies events that have already happened.

A risk-management principle requiring hazards to be reduced until further reduction would cost grossly disproportionate effort relative to the benefit gained. It is central to safety-case arguments in transport operations and is assessed by cost-benefit reasoning.

A documented set of policies, responsibilities, procedures and assurance activities by which an organisation controls safety risk in its operations. Regulators commonly require one from airports, railways, ports and logistics operators as a licence condition.

The assignment of a substance to a hazard class and packing group under regimes such as the UN Model Regulations, determining packaging, labelling, documentation and segregation rules. It governs how freight may be packed, loaded and moved across modes.

Standard international trade terms defining which party arranges and pays for carriage, insurance, customs clearance and risk transfer at named points. They allocate cost and risk between buyer and seller but do not govern title or payment.

A document issued by a carrier acknowledging receipt of goods for shipment and, when negotiable, serving as a document of title. It evidences the contract of carriage and is central to documentary credit and cargo claims.

Twenty-foot equivalent unit, a standard measure of container capacity based on the volume of a twenty-foot container. Port throughput, vessel capacity and terminal productivity are commonly expressed in TEU.

The quantity of containers, usually in TEU, moved across a terminal berth or quay over a period. It measures port output and is distinct from capacity, which is the maximum sustainable volume under given service standards.

The rate at which containers are loaded or discharged per vessel while alongside, often expressed as moves per hour or per vessel per day. It drives vessel turnaround time and terminal competitiveness.

The period a container, vessel, aircraft or passenger spends at a terminal between arrival and departure. Long dwell increases land requirements and congestion, so terminals and shippers manage it through incentives and scheduling.

Free time is the agreed period during which containers may remain at a terminal without charge; demurrage is the charge thereafter for import containers, while detention applies to equipment held outside the terminal. Together they push cargo to move promptly.

Movement of goods in one loading unit or vehicle using two or more modes in succession, without handling the cargo itself at transfer. Containers and swap bodies make the transfer efficient and reduce damage and cost.

Carriage of goods by at least two different modes under a single multimodal transport contract, with one operator responsible for the whole journey. It differs from segmented arrangements where each leg has its own carrier contract.

Transfer of cargo from one vessel, vehicle or aircraft to another at an intermediate hub, rather than delivering it directly to its origin-destination pair. Hub ports and airports build business on efficient transshipment connections.

Application of sensing, communications, computing and control technologies to transport infrastructure and vehicles to improve safety, efficiency and information. Examples include adaptive signals, electronic tolling and traveller information systems.

Signal control that adjusts green splits and cycle timing in real time from detected traffic demand rather than fixed time-of-day plans. It can reduce delay at junctions with variable flows but needs reliable detection and monitoring.

Automated charging of road users through tags, cameras or satellite positioning, allowing free-flow passage instead of stop-and-pay booths. It supports congestion pricing and distance-based charging and reduces queueing at plazas.

Technologies such as barcodes, radio-frequency identification and optical character recognition that capture item or asset identity without manual keying. In logistics they underpin tracking, inventory accuracy and automated sortation.

Software controlling inventory locations, receiving, put-away, picking, packing and dispatch within a warehouse, often linked to scanners and automated equipment. It provides real-time stock visibility and drives labour and space productivity.

A flow where inbound goods are transferred almost directly to outbound vehicles with little or no storage, reducing handling and inventory holding. It requires tight inbound and outbound scheduling and reliable shipment visibility.

Amplification of demand variability as orders pass upstream through a supply chain, causing excess inventory and poor capacity use. Causes include order batching, price promotions, rationing and information delays; sharing demand data mitigates it.

Extra inventory held to cover demand and lead-time uncertainty above expected levels. It protects service levels at the cost of holding and obsolescence, and is sized from variability and a chosen service level.

The order size that minimises the sum of ordering and inventory holding costs under steady demand assumptions. It provides a reference point that is then adjusted for discounts, shelf life and transport constraints.

Charging road users for the use of infrastructure or for travel in congested areas, aimed at managing demand and funding investment. Electronic tolling and cordon schemes are common delivery mechanisms.

The responsiveness of demand to a change in price, income or another variable, expressed as a ratio of percentage changes. It informs fare, toll and policy decisions and determines revenue effects of pricing changes.

A demand forecasting sequence of trip generation, trip distribution, mode choice and route assignment producing flows on a network. Each step uses survey data and behavioural assumptions, and outputs feed scheme appraisal.

A table of trip or freight movements between zones, showing how much traffic originates in each zone and where it goes. It is a key input to network assignment and to terminal and corridor planning.

The sum of discounted future costs and benefits of a project minus its initial cost, expressed in today's money. A positive value supports proceeding, and it is a standard measure in transport project appraisal.

The present value of a project's benefits divided by the present value of its costs. Ratios above one indicate net benefit and allow ranking of competing options, subject to sensitivity testing.

A maintained record of identified project or operational risks, with owners, likelihood, impact, planned responses and status. It supports regular review and is a core artefact of project risk management.

A scheduling technique identifying the longest chain of dependent activities, which determines the shortest possible project duration. Float on other activities shows where delay can be absorbed without moving completion.

Indirect greenhouse gas emissions arising in an organisation's value chain, including purchased goods, business travel and the use of sold products. For logistics, outsourced transport and fuel supply often dominate the carbon footprint.

Total greenhouse gas emissions from producing, delivering and using a fuel or energy carrier in a vehicle. It allows fair comparison between diesel, electricity, hydrogen and other options over the full energy pathway.

Transfer of freight or passenger movements from one transport mode to another, often from road to rail or water for environmental or congestion reasons. It depends on service quality, cost and terminal access as much as policy targets.

A self-guided vehicle that navigates a warehouse or yard using sensors and mapping to move goods or totes without fixed tracks. It supports flexible automation and scalability compared with conventional conveyors or fixed systems.